There is thread in the Bodywork section on my 300D rust repair project. I asked a few questions there, but perhaps more W123 owners read this section. Here are the links:

Questions about Fender fit-up and pockets in footwells:
http://www.peachparts.com/shopforum/3161746-post85.html

In case anyone is interested, I also posted about DIY hole repair under pedal tab.
http://www.peachparts.com/shopforum/3161744-post84.html

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5