Building the 1/6 scale BUSA Sopwith Pup, and am looking for a dummy Le Rhone engine to put inside the cowl Cowl diameter is 6.5" and I will powering with an OS .52 4-stroke.

Looked at Wms Brothers, but don't know how I would assemble the cylinders around the my engine, some sort of hollow "ring" I would guess.

Any suggestions appreciated.