Zulu, Please understand that mine is simply a suggestion, not an expectation. If your really have an interest in this type gun, I would use Terry C.'s drawings. The full set of drawings is 30 or 40 pages and is unnecessarily complicated, besides, 90% of the parts are little metal plates and bolts, etc.
On the tube, however, you can have your choice of 4 or 5 different designs, some are more ornate than others, and the one featured in
Instruction for Heavy Artillery is the most plain of all. The photo below shows a type with a Breeching Ring which gives this seacoast gun a very unique look. There are others which include this visually pleasing feature and Fillets and Astragals too with far more interesting Muzzle Swells.
If you are truly interested, send me your email address via PM and I will scan and send these images to you. That's the very least I can do to help you continue your excellent recreations. Keep up the good work!!
Tracy and Mike
The 'Breeching Ring' is visible in this photo from an unamed "Circle of Forts", fort from the Washington environs.