Re: New to the game
Personally I recommend using a mountain bike with a front shock, its alot more durable than a beach cruiser. I ride my bikes really hard, and the beach cruiser I built just didnt last (cracked the frame after 3 months). My mountain bike has about 2000 miles on it and no major problems yet.
I would also recommend to drill the mounting studs from the stock 6mm to 8mm because they will snap if you leave the 6mm ones in there.
Other than than I would get two motor kits and keep one as extra parts because parts will break.