Man, that is a bad place to have rust. I would strip that thing down and see how bad the rest of the rust is. I would get it sand blasted by some one who has done old cars for some of the resto shops. If the entire top is rusted I might be looking for another CAB. You might could just get a top. or cut out a piece of a top like that.. If the floor, rockers, cab corners and the pillars are gone... I would be looking for a cab myself.
