Anything is doable. I don't think it would be super difficult if you have worked on toys/cars before. If this is a first time, still doable but be patient. Parts & engine could be found at a Motorcycle Salvage yard, Ebay or CraigsList. Honestly, since I have done some of this stuff before, you will have more money invested than if you sold the Ruesch at a loss and bought something else faster that meets you needs. It is a fine line if all the work, time & money is worth it unless you are one of those guys that enjoy reinventing stuff.
rocmoc n AZ/Mexico