RE: Any instructions on how to build a radio control system from scratch?
My first radio system was a Heath Kit 8 channel back in the late 70's. It was a great experience, but I would never want to do it again. In those days there were only something like 7 frequencies available and 3 or 4 were shared with surface R/C. Not only did you have to have an AMA but also a FCC license to operate.