Thanks guys!   I did look into utilising the gun port framing for Speedy, but it would have left the bulwark sides too thick, being planked both sides. I could have reduced the thickness of the bulkheads above deck level, but we're talking less than 2mm thick, coupled with the fact that the horizontal;l and vertical frames need to slot into each other, meaning the thickness in the slotted areas would be around 1mm. This tolerance would be intolerable (!). I would get so many complaints