A while ago, I bought a 1/16 Ertl tractor on Kijiji for $10 to try my hand at a conversion.
I disassembled the tractor, and started to build a frame to mount the motors and steering servo.
Here are picture of where it stands.
Next will be the wheels, and mounting the body.
I'm working with limited tools and knowledge, but I'm liking the experience so far.

My work area is our kitchen, I have a 7x12 lathe, a hand drill and a dremel. My MIG welder is 3 hrs away, so I had a friend stick weld the steering knuckles. Its a bit rough, but for a first project I'm OK with the progress.