Re: Steel or Aluminum
Personally I like a cruiser frame, but a more modern one- not old heavy pig iron with a big sweep of a downtube.. I've built two Huffy frames up- not terribly new, but fairly light oversized tubes, and a Micargi- also more modern with oversized tubes-
Used to race USCF 14 years in my crazy days and was a bike mechanic among other less mentionable things
A cruiser frame has the better clearances for the chain and the tank- I'd use a steel diamond frame otherwise, but the tank is in the way of peddling much, and I bulld a bike with light alloy rims and narrow tires to peddle shut down as well as roll easy for the motor- I never use a chain tensioner, and match the two chains up otherwise- saves much weight and has been very reliable.
so yes, I recommend alloy rims myself- 700 c and probably about 32mm wide for less experienced- non-cyclist riders
Two stroke China Girl is the most practical but 4 strokes are reliable and quiet if you're good with mechanics.