Weight should not be a problem if you compare it with materials typically used to make cannons. Brass and pewter are much heavier. Wood is lighter but not often used to make cannons. I don't know the exact density of Corian but it is probably similar to Plexiglass (acrylics).
Here are some results of my tests. I took videos of all of this but it takes a while to edit and publish that. Perhaps I'll add more later and show the results. But let me use words instead, right now.
1. Bonding Corian with PVA did not work. It fell apart almost by lifting the pieces off the table. No big surprise.
2. My first try using CA did not fare much better, but that was because I did not sand the surfaces. They were as cut on my table saw. When I repeated the CA test after sanding the results were much better. Pulling on the two strips was very strong (I could not break it). However, when bent the two came apart with a snap. This 'cleavage test' is tough on any adhesive including epoxy.
3. Borden's plastic cement did not work very well which surprised me.
The upshot is to try epoxy and if that does not work I'll give up using Corian for anything that needs a strong bond.
Meanwhile I tried turning a square piece in my small lathe. I purposely had the piece stick out of the chuck by about 2 inches. As expected, it chattered a lot when I used a regular bit until I got down to round stock. I forced the issue and took a good size bite which broke the piece in two. The cantilevered end just did not like what I did to it.
I repeated this but after getting it round, I drilled a center hole in the end and used a center support to turn the piece down to about 3/16 inch. After that I forced the bit towards the center and as expected the part broke.
With care I am sure I could have gone down to 1/8 inch diameter and with a shorter piece and some support down further. However, I learned enough to say that this was no worse than I have happen with wood. Metals such as brass are better, of course.
Finally let me just say that I would not make a 'wooden ship model' with Corian, but I may use it for small parts such as cannons and special items.
Let me add this picture. The drawing is full size of the cannons I need. The break did not come as a surprise because I knew that I was stretching the bite I was taking. So, next time . . .
Edited by Modeler12, 14 August 2016 - 06:45 PM.