Cab repair or replace?

[Chevyman680063]

I have a '63 pickup and the cab has a number of areas that need replacing due to rust. The cab corners, area inside above the windshield, top right side of dash where the dash and windshield meet, lower right side of dash between glove box and passenger door opening, several portions of the floor, a small area below the fuel filler neck on the outside, and the top right corner on the outside at a seam where the area above the winshield and the portion that runs down the right side of the windshield meet all need replacing. So what do you guys think would be cheaper...having the areas cut out and replaced or finding a new rust free cab? I'm guessing a new cab would be cheaper after you add labor to the cost of repairing the current cab, and what would a rust free 60-63 cab cost? Thanks