area bove the shocktower looks pretty bad. people are making whole cars out of aftermarket panels now, so it should be available somehow. a doner car would work if nothing else.
if you could find a shell with less rust, you might want to go that route. i have seen complete rear clips from wrecked cars occasionally for sale.
it will be a must to remove the rear springs/diff and also easier with subframe removed to do a good fix, so, yes.
