/diy/ - Do It Yourself

I have an old schwinn S1000 that I want to turn into a project, can anyone give me some ideas and options/different routes I could take? It would have to be relatively quiet, I would put an engine on it if there was a way I could cut the sound of exhaust down to acceptable levels. But I'd love to hear what you guys can suggest. Used to to have my 6'3 family member ride it and it would get him up our steeo hills and every thing so im feeling inspired by the much better battery tech out now