The exhaust pipes and water line are vacuum hose. The rear tread is electrical tape. The roll bar is an axle bent around a tin can. The front wheels are FP small disk wheels with O-rings for tires. The “fast back” shape was made by cutting damaged plates from Bill’s junk box. A rubber band (not shown) connects the 3 speed Gabriel Erector motor to the rear axle. The exhaust manifolds were made from some parts that were found in an Erector set box, but that are apparently not Gilbert’s. He also used them for the runners on his sled model.