Well after alot of reading and research, I have finally decided to get a barrel from Trail Rock Ordnance! At first I was going to go the Mtn Howitzer route, and after talking with Steve about what I am looking for, he told me he had a set of drawing of the ''pack parrott'' Since im not looking for 100% historical accuracy that was the perfect tube for me! Historical pattern, but never fielded, and something a bit different than what most people shoot. So ETA is about 7 ish weeks, and then its going to be a matter of building some kind of carriage. I am by no mean a woodworker so I will try to make something simple to be able to shoot it. I wish to thank you everyone here for your help in answering my various questions throughout the research process. Of course I will take a few pics when I receive the tube!