From a body parts and trim standpoint, including interior pieces, everything is interchangeable between the big truck and the half ton. The only difference is the size of the wheel openings in the front fenders. They're considerably bigger in the F-2/6 trucks than the F-1. If you don't care about that, or have good/decent/usable F-1 fenders to use, you're golden.
Note that the grilles are going to be different between the 52 and your 48, so if you want to look correct, you can't use the nose, and the rear window is larger and the dash is different in the 52 cab, as well, so using the 52 cab on the 48 will be totally different, too. Now all you're left with that's interchangeable is the doors. If you don't mind your 48 looking like a 52, once again, you're good to go.
52 Mercury M-1
among other things.