Well, that crappy passenger side rear door just isn’t going to work. I decided to remove the relatively good skin from the Biscayne parts car, and install it to the inner framework of the original door. The structure is just different enough from a 4-door “post” door, that modifying the other door would not be feasible. I cut the skin off just inside the overlapped edge, leaving the edge so I could retain the original look and not have to mess with grinding my welds perfectly straight. I split the panel right below the beltline trim, since the top portion of the door skin is a little different between the hard-top and the “post” sedan. Welding all the seams for this panel was no picnic, and took quite a bit of time… but in the end, the door no longer had its twist, and it fit the car very well with nice gaps. Of course, now I have to locate and make all the trim holes by hand since the Biscyane door does not have the same trim that the Impala does.