With the car dry assembled to the doors as supplied, the door could be removed, and the skin safely stripped away, safe in the knowledge that all references are in place.
This door was pretty mucky inside, and needed a few frame repairs.

Barry: With the frame repaired, and multiple test fits to the aperture (as they move a lot during the repairs, hence why it's critical to have your shut-hole all ready pre-aligned), the door could be prepared for the new skin.
Again, after multiple fittings, the skin could finally be tweaked over and welded into place. When they go well, they are a very rewarding panel to see back on the car. There are multiple ways of royally cocking it right up though, so it's always a relief to get the doors fitted for the last time.