Re: Gas tanks!!
Check your local listings for a motorcycle salvage yard near you. If they're kind they'll let you poke through what they have. There are plenty of small motorcycle tanks that lend themselves well to motorized bikes.
Look for a Yamaha MX 80 tank. They look good and mount easily with a little fabrication. Also the Suzuki Junior had a sweet little tank.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"