The picture of the barrel above looks like a British Armstrong or Armstrong Frederick, not Spanish cannon. While not complete the following is the Spanish pattern used from 1765 to 1808. If you redraw these in 3D you can get them 3D printed at a good price. I paid about $15 for twenty barrels, including freight for Commonwealth pattern barrels. I can post as TCW, DXF or DWG drawings if you wish. Photos below are 1:64 scale and one that I had printed at 1:24 for a desk top project.
Allan


Allan

