Finished

 The barrel and hardware were phosphate conversion (Parkerized) treated. This protects against rust and also provides a more authentic color without the gloppy thickness of paint. I like still being able to see the tool marks. Cannons were lumpy.

 The carriage was made from some 100-plus year old oak I had laying around. I made square nuts for the tie bards from hex nuts. The iron bands on the wheels are 3/4-inch conduit with the galvanized etched off and Parkerized.

In principle I could fit it with  the aiming and restraint ropes, load it, and fire something. It's bored through to the touch hole about 0.27 inches, if I recall correctly. The breach also opens, because I turned the knob as a separate piece and threaded it to the main bore. The elevation wedge is functional.

 

 I wanted some lathe practice. I think I also wanted to demonstrate that a Vevor lathe can turn steel. You just have to tune it up, use small radius tools, keep them sharp, and take thin cuts. Much of the materials was removed using power feed. I suppose it is old school, but I have some Stelite bits that I really like. They hold an edge longer than HSS and can be sharper than typical carbide tips.