Jaager

If the object is to be able to get a precise and reproducible  saw tilt and this will be done frequently with multiple possible angles being cut:
 
Fix the machine to a two plywood sheet base.
Lower is a 1/2" - 3/4"  sheet.  width 3" or more wider than saw base on each side.
Upper is  1/4" sheet
The right edge of upper sheet is at the right side of the saw base.
The upper sheet is attached to the lower using a full size piano hinge.
The left side is as far beyond the base of the saw as is needed to fix a a threaded rod and thumb screw or wingnut to raise that edge.
There would probably need to be spacer pieces at the hinge and outer edges of the upper sheet that are a tad thicker than the thumb screw/wingnut.
 
Someone really OCD could fix the angle gauge from a adjustable miter -  or a stick with marks  at the front right at the hinge.
 
The down side is that it adds weight to an already hefty machine.
A 1" rubber stopper fixed under each corner of the base will provide space for fingers to lift the machine, if it just rents bench space and lives on a shelf.

Hank,
 
I would give serious thought to using a sheet of 2"  Starfoam (E.KY) insulation.  It probably only comes as 4x8.
One sheet may get you a double layer. 
Hinge it along the top edge.  A long pole can keep it open or a distal hook in the ceiling and a loop with the sheet.
It may require 1/4" ply to hold the hinges.  It is porous enough for PVA to hold it all together.  LiquidNails also works.  Weather stripping along the border and strong magnets at few points to hold it all closed tight.

Some of the old books about how-to model ships suggest dry pigments (Japan?)
I wonder if the dry or oils are minerals and the acrylics are organic? 
The chemical industry started with the synthesis of organic pigments.  But complex organic molecules are much more subject oxidation than minerals, some of which may already be oxides.
As a practical matter on the subject of the desirability of using archival materials, although I completely agree with you, I suspect that the issue will soon prove to be a moot one.  We have already passed an inflection point and show no indications of having the will to do what is necessary to avoid generating one or two more.

Hank,
 
Starfoam is how coworkers who were from eastern KY pronounced Styrofoam.  (The patient water glasses at our VAMC were actually beaded starfoam cups.) 
A door with hinges at the top - to seal the storage cubby.   When I imagined this solution, I envisioned the opening as being pentagonal - and thought that two half doors would do the job - but it looks like you finished it to be rectangular, so one will do.
A loop of bungee cord for a handle - a gaff hook to pull it open and place the loop in the hook that keeps it open.
 
American Science & Surplus  has a tube of 29 plain donut magnets for $6.00.  They are strong enough to keep a seal if paired and 4 or 5 sites are used.
The only downside is the spam catalogs - but the paper is the right stuff for starting a fireplace log. 

Hank,
 
I would give serious thought to using a sheet of 2"  Starfoam (E.KY) insulation.  It probably only comes as 4x8.
One sheet may get you a double layer. 
Hinge it along the top edge.  A long pole can keep it open or a distal hook in the ceiling and a loop with the sheet.
It may require 1/4" ply to hold the hinges.  It is porous enough for PVA to hold it all together.  LiquidNails also works.  Weather stripping along the border and strong magnets at few points to hold it all closed tight.

I believe that the Physics involved would require sideways movement with both fixed guns and guns that recoil. The amount of movement and if it was enough to be observed is another factor altogether.  The greater mass of the ship and the resistance of the water suggest that when the equations are run, the number would be a small one.  Today, with our tech, a real number could be measured.  It might be  mm or cm  but the force has to go somewhere.  If it were localized at the points of attachment to the side of the ship, it would be just compression of a small volume of wood that absorbed these forces.  The body of the ship is a series of interlocking components that were built to transfer and diffuse these significant forces.

Some of the old books about how-to model ships suggest dry pigments (Japan?)
I wonder if the dry or oils are minerals and the acrylics are organic? 
The chemical industry started with the synthesis of organic pigments.  But complex organic molecules are much more subject oxidation than minerals, some of which may already be oxides.
As a practical matter on the subject of the desirability of using archival materials, although I completely agree with you, I suspect that the issue will soon prove to be a moot one.  We have already passed an inflection point and show no indications of having the will to do what is necessary to avoid generating one or two more.

Hank,
 
I would give serious thought to using a sheet of 2"  Starfoam (E.KY) insulation.  It probably only comes as 4x8.
One sheet may get you a double layer. 
Hinge it along the top edge.  A long pole can keep it open or a distal hook in the ceiling and a loop with the sheet.
It may require 1/4" ply to hold the hinges.  It is porous enough for PVA to hold it all together.  LiquidNails also works.  Weather stripping along the border and strong magnets at few points to hold it all closed tight.

Hank,
 
I would give serious thought to using a sheet of 2"  Starfoam (E.KY) insulation.  It probably only comes as 4x8.
One sheet may get you a double layer. 
Hinge it along the top edge.  A long pole can keep it open or a distal hook in the ceiling and a loop with the sheet.
It may require 1/4" ply to hold the hinges.  It is porous enough for PVA to hold it all together.  LiquidNails also works.  Weather stripping along the border and strong magnets at few points to hold it all closed tight.

Some of the old books about how-to model ships suggest dry pigments (Japan?)
I wonder if the dry or oils are minerals and the acrylics are organic? 
The chemical industry started with the synthesis of organic pigments.  But complex organic molecules are much more subject oxidation than minerals, some of which may already be oxides.
As a practical matter on the subject of the desirability of using archival materials, although I completely agree with you, I suspect that the issue will soon prove to be a moot one.  We have already passed an inflection point and show no indications of having the will to do what is necessary to avoid generating one or two more.

You are, of course, correct. When I said it wouldn’t move, I meant that any sideways movement would be  insignificant, negligible - not that it would be absolutely 0. 

I believe that the Physics involved would require sideways movement with both fixed guns and guns that recoil. The amount of movement and if it was enough to be observed is another factor altogether.  The greater mass of the ship and the resistance of the water suggest that when the equations are run, the number would be a small one.  Today, with our tech, a real number could be measured.  It might be  mm or cm  but the force has to go somewhere.  If it were localized at the points of attachment to the side of the ship, it would be just compression of a small volume of wood that absorbed these forces.  The body of the ship is a series of interlocking components that were built to transfer and diffuse these significant forces.

Mark,
 
I think this is a lot more involved.
If the projectile was frozen in place and the charge ignited, the gun would not move.  It would be a bomb and if it remained intact, a pressurized vessel.
The force of the recoil is equal to the mass of the projectile times the gas expansion velocity squared (while the projectile is in the system).
The rate of gas generation - the gas pressure - has a more significant effect on the projectile.  Recoil or no recoil, the gas pressure in the chamber does not change.
Flames coming out of the mouth of the cannon before the projectile = a poor fit and much loss of pressure pushing it.
Flames coming out long after the projectile has left = slow and inefficient generation of gas,  gas that is pushing against atmosphere instead of a solid.

There is more movement than that in the visible range.  The atoms are what is actually being subjected to the force. 
I think that a segment about an F86 in Korea demonstrates some of the forces.  There was something like 6 or 8 50cal mounted in the nose.  A first generation pilot said that they had to be careful when chasing a MIG, not to fire too soon.  Firing the guns slowed the F86 down enough that the MIG could pull away.   The shipboard cannon would impart rearward force on the side of the ship.  If the structure held, that force would be transferred to the whole ship.  The ship would move backward.  It might be difficult to measure and it might not be significant, but I suspect that in a stern chase, a fixed gun firing would widen the gap between two ships enough to matter.

Mark,
 
I think this is a lot more involved.
If the projectile was frozen in place and the charge ignited, the gun would not move.  It would be a bomb and if it remained intact, a pressurized vessel.
The force of the recoil is equal to the mass of the projectile times the gas expansion velocity squared (while the projectile is in the system).
The rate of gas generation - the gas pressure - has a more significant effect on the projectile.  Recoil or no recoil, the gas pressure in the chamber does not change.
Flames coming out of the mouth of the cannon before the projectile = a poor fit and much loss of pressure pushing it.
Flames coming out long after the projectile has left = slow and inefficient generation of gas,  gas that is pushing against atmosphere instead of a solid.

There is more movement than that in the visible range.  The atoms are what is actually being subjected to the force. 
I think that a segment about an F86 in Korea demonstrates some of the forces.  There was something like 6 or 8 50cal mounted in the nose.  A first generation pilot said that they had to be careful when chasing a MIG, not to fire too soon.  Firing the guns slowed the F86 down enough that the MIG could pull away.   The shipboard cannon would impart rearward force on the side of the ship.  If the structure held, that force would be transferred to the whole ship.  The ship would move backward.  It might be difficult to measure and it might not be significant, but I suspect that in a stern chase, a fixed gun firing would widen the gap between two ships enough to matter.

Mark,
I suspect that the reasoning behind fixed guns is specious. I remember all those pesky force vector lines from Physics.  I believe that the reverse direction force would be at the point of attachment of the gun to the ship.  Very little was probably redirected to the back of the projectile.  This does not mean that the time frame for the development of tactics for the use of guns at sea was any different.  What was believed to be true the determining factor.  The later method of allowing recoil and the dispersion of the reverse force over multiple points of attachment probably saved wear and tear on the body of the vessel.  
Another thought:  at the point of combustion, the force is spherical.  Would not some of the compression of the atoms of the breech be converted to heat?

This is straight out of my head, so no pictures.
Most table saws that can do a rip cut that is other than 90 degree vertical - tilt the blade.
The Byrnes saw holds the blade vertical and tilts the table - the right of the blade part of the table.
Kurt and No Idea suggest that because of gravity and friction,  the wood can move away from the blade -because it  mostly rests on an angled surface.
They mimic the standard table saw by tilting the blade, and making the accessory table horizontal.  The rest of the saw goes with the blade.
The saw comes on its own base.  A heavy one.  They place wedges  under the base to angle it up.  I would want a stop at the right side edge to keep the saw from sliding.
 
My suggestion is more elaborate and only makes sense if a whole lot of beveled ripping is going to be done,  and if several angles are involved.
My picture:
Lay a book flat on a table. Turn it so that the top of the book is facing you and the spine is on your right.  Lift the front cover.
Imagine a small version of the saw sitting on the top cover.   The cover is lifted until the right side saw table accessory is horizontal.
 
Use plywood to make the two book covers.  Use a full size piano hinge as the book spine.   There are holes in each corner of the saw base.
Fix the saw base to the top piece of plywood.  As heavy as the saw is, I think two pieces of 1/2" ply will be needed.  The bottom needs to be wider than the top - enough beyond the hinge the the whole assembly does not flip sideways.
The threaded rod and nut are not needed actually.  A block of wood, square even will hold the top cover at the angle.  A way to fix it in place would probably be a good idea.  
 

Mark,
I suspect that the reasoning behind fixed guns is specious. I remember all those pesky force vector lines from Physics.  I believe that the reverse direction force would be at the point of attachment of the gun to the ship.  Very little was probably redirected to the back of the projectile.  This does not mean that the time frame for the development of tactics for the use of guns at sea was any different.  What was believed to be true the determining factor.  The later method of allowing recoil and the dispersion of the reverse force over multiple points of attachment probably saved wear and tear on the body of the vessel.  
Another thought:  at the point of combustion, the force is spherical.  Would not some of the compression of the atoms of the breech be converted to heat?

Mark,
 
I think this is a lot more involved.
If the projectile was frozen in place and the charge ignited, the gun would not move.  It would be a bomb and if it remained intact, a pressurized vessel.
The force of the recoil is equal to the mass of the projectile times the gas expansion velocity squared (while the projectile is in the system).
The rate of gas generation - the gas pressure - has a more significant effect on the projectile.  Recoil or no recoil, the gas pressure in the chamber does not change.
Flames coming out of the mouth of the cannon before the projectile = a poor fit and much loss of pressure pushing it.
Flames coming out long after the projectile has left = slow and inefficient generation of gas,  gas that is pushing against atmosphere instead of a solid.

Mark,
I suspect that the reasoning behind fixed guns is specious. I remember all those pesky force vector lines from Physics.  I believe that the reverse direction force would be at the point of attachment of the gun to the ship.  Very little was probably redirected to the back of the projectile.  This does not mean that the time frame for the development of tactics for the use of guns at sea was any different.  What was believed to be true the determining factor.  The later method of allowing recoil and the dispersion of the reverse force over multiple points of attachment probably saved wear and tear on the body of the vessel.  
Another thought:  at the point of combustion, the force is spherical.  Would not some of the compression of the atoms of the breech be converted to heat?

Mark,
I suspect that the reasoning behind fixed guns is specious. I remember all those pesky force vector lines from Physics.  I believe that the reverse direction force would be at the point of attachment of the gun to the ship.  Very little was probably redirected to the back of the projectile.  This does not mean that the time frame for the development of tactics for the use of guns at sea was any different.  What was believed to be true the determining factor.  The later method of allowing recoil and the dispersion of the reverse force over multiple points of attachment probably saved wear and tear on the body of the vessel.  
Another thought:  at the point of combustion, the force is spherical.  Would not some of the compression of the atoms of the breech be converted to heat?

A machinist square?

A machinist square?

This discussion has me wondering a bit more about scale effect as it applies to color.  
I am wondering if @ 1:600  the black would look better if it were actually a very dark grey.
If it is an Atlantic Ocean vessel,  just a slight hint of green in the dark grey?