Hi Sean,
Sorry to jump on to your thread, but I'm in a similar position to yourself, but with an 80k mile VR6. The extent of the rot seems to be limited to the following:
Both doors (one could be repaired)
Tailgate (could be repaired),
Radiator Support Member (It's gone),
3 small patches on the floor, and may be wise to replace outer sills,
All steel work on front and rear bumpers
There is rust around the windscreen, and I think there is a little water getting in here,
Car also needs new brake discs, pads, (possibly calipers), suspension struts, and wishbones.
The car does have the following positive points though:
Completely original, with no accident damage (apart for rotten door)
Engine, gearbox, clutch and exhaust all seem to be working well,
Back end; wheel arches, fuel filler, rear panel appear to be rust free, apart for a localised hole right at the Corrado badge.
My plan is to spend the minimum possible to get it through an MoT, and then run it for a while to see if it's worth committing to improving it cosmetically. Currently sourcing parts, but having difficulty sourcing the Radiator Support Member. I noticed a thread on here a while back, where someone was looking at getting some stainless steel / aluminium parts made, but it didn't seem to come to anything. I'd really appreciate it if someone could help me track down one in good condition.