Maybe a bit late on this thread, but just completed the Christmas Cannons for all the men in the family, sons, grandsons, nephews.
These were constructed of 1021 cold rolled for the barrels and wheels, brass for the axles and fittings and copper for the trunnion holddowns and white oak for the carriages.
I did a batch of silver and gold bracelets for all the ladies in the family a couple of christmas's ago, but thought cannons were more fitting for the men so started this project in June. Seems age takes its tole as it sure takes longer to get stuff done these days
Has been a fun and learning project, lots of specialized tooling had to be built along with trying to have them completed by this christmas.