No6A Compound Marine Engine 1-12

This is a 1/12 model of a Stuart No 6A compound marine engine, sold a an unmachined set of castings by Stuart models in England. At 120 psi and 750 rpm it produces about 4 bhp, enough to power a steam launch of up to 23 feet. Bore is 2 1/2 and 4 inches, stroke is 3 inches.  The engine is 20 inches tall and a smidge under 18 inches long, this model is 1/12 of that, thus 1.66 inches tall and 1.5 inches long.
I have modeled it from original blueprints and on line photographs and I'm confident that every detail of the original is included therefore it must be printed in utra fine detail plastic.
This is a marine engine in a scale popular with boat modellers. It might be useful in G scale model railroad applications but can not be made smaller for use in HO.