I'm heading to Germany in late November as well, I don't have much time to spare but I'm going to try make an effort to get to Auto & Technik Museum Sinsheim, it's just outside Heidelberg which is about an hour by train from Frankfurt. The reason I am keen to get there is that they have a Concorde and a TU-144 (Concordski) on display, both are open for walkthrough. Don't know too much about what else is displayed there though.
See:
http://en.sinsheim.technik-museum.de...useum-sinsheim