If I were you, I'd get the S-10 loaner, strip the body off, and just start fabricating body mounts, starting with the cab. You'll need to fabricate a transmission tunnel in the '41 cab, so might be a good idea to cut out the S-10's floor pan and reuse that with your '41 cab.
That's what I plan on doing if I ever actually get my Dad's Sonoma that he keeps telling me about. Then I'll be looking for a dead half-ton AD to use the body panels. I won't be keeping "Captain Anemic" though, (the 4.3 liter V6). Biggest boat anchor I've ever seen. And DIFFICULT to work on!!!
Instead, I'll be building myself a nice little 327 and sticking my tuned port injection on it that I kept when I got rid of my old IROC-Z. Not enough torque to blow up the tranny probably, but a lot better engine than that 4.3 liter.
