looks like you are getting there david. a couple of things I do
make a template of the curve next to the seam[just a bit of ally flat1/2" x 1/8" bent on edge]. once you start cutting, the seam and panel will go out of shape.
that inner panel I would replace. cut it off along the line of the angled section, and cut out new one to fit. bend it to the template curve.
give the inside plenty of rust proofing
when fitting the outer panel I seal all round with sealant the bolt it into position like you have done, then just stitch weld it. bit by bit so it will not distort as much.
The place where I cut is right on the corner where the panel turns to form the door edge. do not go inwards as it makes it harder to clean up
this is one I did recently, but "slinky" has a full set of how to do pics of his car when I showed him. I think he may have posted them before.
The problem with the inner rusted like yours is that it will be all out of shape and the hinges when tightened up can pull the outer panel in and form a dent. Try to dent knock so that both panels curve exactly.
This is where the template is handy.
Do not worry too much, the more you do the easier it gets.

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