I am looking to see what the appropriate way to restore my 1976 Warlock is.

We bought the truck from my Father-in-Law, it's really my Wife's truck, it has some sentimental value. The truck isn't in great shape, both cab corners are shot, the lower portion of the doors were poorly patched and it has a hacked aftermarket sunroof.

The easy solution would be to find a cleaner [one can dream of a rust-free] cab and just swap it. Are the truck cabs stamped/marked with a VIN like some certain areas of car chassis?

Obviously I am not looking for anything dishonest, I'll put a roof on it if I need to....but if swapping cabs is an "okay" thing to do, I'm interested! What's the verdict?