Welcome to the Stovebolt!
You can probably find a 1/2-ton chassis pretty cheap. I think there is one in the freebie section of the swap meet.
Its going to be a lot of work. There are not a lot of bolts holding the cab on, but you'll also need to deal with the electrical, the steering column, the shifter and the pedals. You'll be moving the engine and transmission.
I'm assuming you'll find a frame with front and rear axles, but be aware that the rear axle on a 3/4 is different in design than on a '50 1/2-ton.
The wheelbase on a 1/2-ton is 116 inches. A 3/4-ton is 125 inches.
If you are hot rodding, as in putting an IFS under it, and swapping to an open type rear axle, just shorten your 3/4-ton frame and either cut down the bed, or find 1/2-ton bed sides.
