Originally posted by Justhorsenround:
I'm a little reluctant to use the S-10 because I think you have to use adapters to get the wheels to clear the sides of the box.
Use a wider rear under it. You'll find swapping a different rear under the S-10 far less work, far less fabrication, than any other frame swap based on a GM product with disk brakes.
You might find something non-GM that will fit better, but I'm not one who could help you with that.