Can you point out the actual damage? Specifically? Remember a very important thing. As I try to understand what is damaged, DO NOT replace any more than is actually damaged. Just cut out the damage and replace with as small of a patch as makes welding/fitting sense. It does look like you have a donor pieces that will work just fine, if I new what you were trying to fix?
I don't see big dents or any rust? Can't see how bad the over extension crease is?
Silly question from someone
who does not see it yet but if your damage is around the vent opening, can you not just hammer and dolly the area and the existing flange for the door and just use the donor door and hinge? Sorry but I am getting slow to understand things now a days. Makes me look like I'm arguing. Maybe you have rear access problems but I'm not getting why you don't gently pound outward on crease to either just proud and back down or shy of proud and fill. There are plenty of shapes and bends in that area and there will be little or no metal movement/stretching when hammering. Is it more than just a sheet metal damage? like frame of drivers door is bent. See if Robert thinks cutting out and welding is really necessary here now with pics you have supplied. Need more pics! I thought, wrongly, that the choice was make new or buy new. Didn't realize you had a good donor piece.
