I have been planning on doing this build for a long time and I finally decided to go for it. About 5 years ago I bought a 1982 ATC 70 and a 1970 us90 both in rough shape. The us90 had a 1979 motor and rear axle but didn't run and had lots of problems. The plan is to build an aluminum frame that uses the 90 axle and brakes. Also the gas tank will be aluminum since the 70 tank was rotten.