This is how I was thinking of attempting it. I realize that the front door skin is longer but a cut off disc on an angle grinder works wonders.
I did take some careful measurements and it appears that the front skin will line up in the doorhandle area leaving just the front edge to be trimmed. In the photo, I drew a crude dotted line where I would trim the original skin, leaving the upper part intact. If you notice, the doorskin is slightly different at the top in the area that I circled, this is why I would leave that area intact.... I figured once at that point, I could cut the new skin at the same spot and weld up everything as ebfabman does.... then just go ahead and crimp the doorskin on as originally done....
Just my ideas. Anyone else think of a way yet???