Pretty good list so far.
Windshield washer fluid tank and radiator overflow tank would make good water carriers if you can clean it out well. Maybe a good reason to use the non-toxic (less toxic) "green" antifreeze. The washer hoses can be used for drinking straw or siphon.
Tape wrapping on wire bundles may be re useable.
Trunk (boot)liners are often made of removeable padding for insulation.
Car tires don't come with inner tubes any more and good luck trying to cut up a steel belted radial. I don't know if the little doughnut spares are more useable.
leo