Tognotti was selling Trostle chassis, and had purchased 6 of them to sell, so yes, Bob did build the first few. Tognotti took one and went to California Cycle Works and had them copy it. Rick Ferkel, sponsored by Kear's, who had a deal to sell Tognottis, got to give some input that was put to use, one item being the motor plate location. Rick divulged that detail in an Open Wheel article, from 1980 or 81 if memory serves correctly. I have heard that CK Spurlock was also selling Trostle chassis, and the first Gamblers were also Trostle copies. Corrections welcome.