Like Dave Lux, I suggest you put it to one side and concentrate on your other cars first, beginning with the car in best shape.
Yes, it's rusty, but has a rarely installed sunroof and also the dual air conditioning which "may" have been a rare option.
There is (in my mind anyway) too much propensity to write off a vehicle as being a "parts car" when it "may" be able to be brought back once a thorough investigation has been undertaken.
My point is that there weren't many imperials made in the first place, and automatically writing off seemingly every one as a "parts car" is a sure way of removing any possibility of cars like this returning to the road, let alone telling future members "there are none left as we condemned most as parts cars."
Should this truly be suitable only for parts so be it, just give her a chance first.
I'm also beginning to think that "we" should get the best deal possible and grab even extremely rusty cars to strip for anything useable- yes, some sellers are dreaming but since these cars were built in low numbers, it's (my opinion) better to trailer it away regardless- another one to save other vehicles, don't walk away until "all" these cars have completely rotted away to uselessness.