The 1/3rd scale Rumley has a model A front end narrowed with steel wheels from an old silo filler carraige. The rear end is cut down model A with the ring gear replaced with a 50 chain sprocket. The engine is a restored T&G, 1.5 HP McCormick Deering. A 'B' size v belt serves as the clutch and drives a '50 Chev 3 speed transmission, which then powers the differential with roller chain. The rear wheels are from the steering axle of an old horse drawn manure spreader. The frame and "muffler" are fabricated out of mild steel. It runs about 3-4 mph in high gear. It powers some of my restored toys at various "old engine & tractor shows".
John