I am sorry I did not answer your question about construction details on a cannon. I built them to 1841 blue prints. It takes about 3 to 4 months for me to build one by myself. I bought raw castings for the barrel it weighs about 1400 pounds. I done all of the machining including the bore. I hand forged almost all of the carriage parts. There is a substantial amount of wood working. The pay back is ok I guess when you are doing something you like. The price don't count that much. a standard 6 pounder with a smooth bore paid me $22,000.00 each, without a Limber if I made a Limber for it that would be another $6,000.00. I sold my machine shop in Fort Worth and bought land on the Blanco river in Wimberley Texas.