NO...Dont do that...Aluminum and bike motors don't play well together...Steel is the best way to go with these motorised bikes...As far as gears are concerned, that could complicate your build of a bike somewhat as well...There are guys here who would be able to coach you through that though...as for me, i just stick with the Beach Cruisers for reliability and tough steel frames...DAMIEN
Ps...When figuring out if a bike im buying has a steel or aluminum frame, i take a magnet with me...lol.
Also most of those bikes, If not all of them at Wally World are Chinese made and they are just lousy with aluminum