I know that much of those wrinkles in the metal can be relieved with several careful body pulls, but the best way to do that car would be to do a "rear clip" installation. Which would need donor car for the rear sheet metal. KEY thing is that this is a UniBody car and that could complicate things a good bit. Getting the new sheet metal on it square would be an issue, too, plus all of the welding to make things right, just to get "to paint". BUT at $100.00/hr labor (or more), the cost to do these things would escalate quickly.
Unfortunately, it IS too nice of a car to part out, but unless somebody's "in love with it", parting it out would probably be the best thing to do. Consider, too, that the rear floor pan is probably tweaked and kinked, too . . . and all that would entail to correct it. Plus the fuel tank and lines. Even at least one rear spring.
Even if it had been a fancier big block car, the ultimate fate would be the same, I suspect. Unfortunately, the "business decision" decision would be to take your time and part it out, or let somebody else do that. There ARE lots of good parts there, for sure.
Just some thoughts,
CBODY67