Hey Marv, great job on that deck gun, and all the other model planes, some quality work their. I don't have any plans from other sources I make them up as I go and then I sometimes have to modify the parts when I make them so they wouldn't be much good to anyone. When I started this project I used a dos cad program, Easycad, then moved to autocad 12 for a little while, didn't like it much, then onto Quickcad a 2D program which was great and I still use it sometimes and now I use a couple of 3D solid modeling programs, so they are in a mishmash of formats which may be convertible to say a DFX format, but the drawing quality varies, I'm just a amateur draftsman with a couple of years training in high school with pen and paper and that was over 30 years ago. I work off of what ever pictures I can find and out of a book called "Early British Quick Firing Artillery" by Len Trawin at Nexus press which has some line drawings (no dimensions) as well as specs on the 18 PDR. I haven't even seen an 18 PDR in real life yet. Anything I can do to help you out with info, just ask. I'll try and get some 3D drawings of the barrel and breach block posted here if I can squeeze them out of my cad program, not always easy.
I'll check into changing my profile.