Michael: As pertaining to a Verbruggen Pattern, any pattern would need to have a split parting line. If below center trunions, that would make for a vertical parting line to be able to pull the trunions from the mold - and makes it vastly more difficult to cast in place dolphins or decoration on the 'top' surface. share me an email, and I'll send some pix of some patterns for ideas.
Your turning skills are awesome! As to drawings, we do not have any on the Verbruggen / 3 pounder. The pattern was originally commissioned/built/supplied to us by Lawrence Campbell of Campbell Cannon & Carriage from Miami Florida.