New member, just bought this with my son-

No holes in the floor or supports that I can see so far. Rear quarter has about a 1" hole behind the tire. Some bubble rust on the other side, but for a MI car, I was pretty surprised. Interior underneath that giant window is smoked, and there has been some water intrusion or condensation- smells kinda mildew-y. Doesn't seem to have a lot of dough on it, but you know how that goes.
At one time, someone had fogged a coat of **** paint over the original, and it is turning to dust. I'm going to try to polish it off as I can see what's really under it.

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Nice, looks like a good project.. at least you can buy interior pieces for it :) And a ozone machine will get rid of the mildew smell