How far is to far gone?

How about doing as much as you can for free and then deciding? Things like stripping the car down and removing the interior will have to be done anyway, so why not start there! Bag and tag everything in case you get to the point where you decide if its worth your time/effort and you won't be out anything but your time! If you decide to keep going you'll already be ahead, and if you decide it's too far go e you still be ahead. You can then decide if you'd like another body in better condition to rebuild, or find a car you really want and sell some of the parts to earn $$$ to spend on that!

Either way, you'll be in a position to accurately assess what you have, what it needs and if you are up to the task at hand!! Geof