Hi Richard, hope you're well?
There was one car that I looked at that really was beyond saving (2.2S Coupe), and one other that was very close: not through rust though, terrible previous work. That one has now, I believe gone in the bin.
Garry: yes the inner wing out does make it a bit floppy, but I've got the B-piller braced up (just visible in pics), and more to the point, I've the other side as my guide. I'll set the outer body measuring rig to one side, and set the other to the same value: it's for exactly this sort of thing that I built it. In addition, you'll note the nearside door is in place: this has already been marked up and photographed against the old inner wing to give me another guide for the inner wing placement. Just gives another insurance policy.
I was saying to John earlier that actually, these big chunks of removed panels aren't the problem, just as long as you've retained all of the reference points, it's the multitude of tiny fiddly repairs that really eat the hours up. I'm sure John will pop up some highlights (lowlights?) of some of the parcelshelf area soon. Suffice to say there'll be a lot more work sorting this area and the rear screen surround than doing say, the floor replacement and all of the sill-work.
Thanks for the comments as ever

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