There is only 1 casting for this engine. Everything else must be fabricated by the builder. I purchased the drawings from Les Chenery in the UK. Another "some day" project! This is a picture of a model built by Ron Colonna. If you are not familiar with "rotary" engines, the crankshaft is fixed and the entire engine, cylinders and all, rotate about the crankshaft. "Rotary" in our case, does NOT mean an automotive type Wankel engine!