I'm a newb too, but If you start with a Schwinn cruiser (Or similar) bike, and track down a reproduction Whizzer style tank (i've found a 1.8 gal and 1 Gal) with one of the Chinese engine kits it would be a good start. I would probably do a couple of upgrades, or at the very least upgrade all of the engine hardware and a few other recommended reliability mods, and you should come close. I'll try and hunt down the link that I found on this site that had a lot of that information on improving the reliability of the engine. I think it really comes down to what kind of bike you want to end up with, but if you don't care about going 40+mph with your hair on fire, then I would look at suggested mods to increase the low RPM grunt of these little engines. That is kind of the direction I am leaning toward.