Donor car, what to pull off

Well, you called it a "donor", so I'm guessing the engine at least is going to get swapped into something else... so here's a word to the wise:
Don't touch a thing. Yet. Keep it whole for as long as you can.
As your swap progresses, you are going to find a lot more things you need than can ever be put on a list here. Wire harnesses/connectors, sensors, body control modules, brackets, mounts, heck, some guys have swapped in the entire dash just to simplify (?) the installation. And all you'll have to do is walk over to the vehicle and grab them.
Plus, leaving it whole keeps it mobile (life can get in the way of even the most well-planned project) so you can move it around with a minimum of fuss. You can still start it up occasionally to keep things functional- there's nothing worse for an engine than to sit stagnant for five years while life sorts itself out- lifters stick, injectors gum up, fuel goes bad and causes all kinds of issues. And you don't have to try to remember how it all goes back together, because you lost all the pictures you took when your phone went for a swim in the toilet last New Year's Eve...