The right rear door on our 1954 Chevy (210 - may be a 150 - 4 dr I'm not a Chevy guy) has old body work that was necessary and is awful. The least expensive option would be to replace it. Does the 4 door station wagon have the same rear doors as a 4 door sedan?
Nope, the window opening is different. It may be possible to cut the top off your wagon door and graft it to a sedan door, but I'd look very closely for other differences before trying it...
I guess I could cut up the bottom of a donor door and do a transplant. The "hump" was pretty well abused, as was the door edge by the hump. Does that sound like a solid idea?
Again, I'd make sure the lower part of the door is identical first. Sometimes on changes between body type they can move character lines around a bit. If it is, I think I'd try transplanting just the outer skin if that's where the damage is.
The front and rear doors on the 1953-54 Chevy wagons ( known as "tin woodies"), are unique to station wagons, not only are the window openings different than for sedans, so is the inner and outer door stampings (done to accommodate the stripe of "phony wood" at the belt line). In other words, a sedan door is not a direct replacement, although you might be able to use pieces of a sedan door as patch panels. The best option is to find another station wagon door.
@Bobacuda .....all good advice in above posts. Though much than the Chevy wagons, Pontiac wagons used the same body shell. I would also investigate if '49 thru '54 share the same wagon doors. The Sedan Delivery models share some body sheet metal through that period. Sometimes when dealing with lower volume production models, manufacturers will 'carry over' some parts to save tooling costs. I am NOT saying this IS the case here, but worth researching a bit. In any event, best wishes with repairing your wagon. Ray