Hmmmm I wonder how salvageable this situation is.

I would put it up on a rack and just rip off all the undercoating in that area and see whats going on. I'd put on new sills and fix whatever else.

Alas, I do not have a lift.

Ideally...I would find a nice healthy SWB W126 with bum motor/trans and dump the 300SD's drive train into it. Both this SD's engine and transmission are in quite good shape. I just dumped like $600-800 into new motor mount, turbo rebuilt, intake/exhaust reseal, oil pan reseal, turbo drain tube replacement, new valve cover gasket, upgraded alternator/wiring, and a freshly tested and balanced set of injectors.

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k