But fabrication requires at least welding skills and at the most a CnC machine. I doubt the OP has either. Not to put him down, just assuming we are working with the least resources here. If you want to power something there are motor conversion kits for bicycles. Grab one and strap it on. You will learn a lot about engines and mechanical engineering the process. I'm always for tinkering, but don't get into a project that you can't finish.