I found the cannons/carriages here...
http://www.bluejacketinc.com/fittings/fittings15.htm
I hope you both post some pictures of your builds!
I did not know Admiral Semmes was a Mason. Yes, I'd like to find correct boats for it also. This will be my 3rd build on this so I want it as correct as possible. I built it once back in the '60's, again 3 years ago and will probably start on it by May, hopefully. So I'm hoping to glean as much info from everyone as I can before I start.