[elhigh]

When I still had it, my Dodge Caravan appeared to be a collection of parts flying in close formation, and none were especially respective of each others' personal space. It was a rattly, squeaky disaster.

I spent a couple of hours one weekend before a big trip, taking every interior panel off and reinstalling it with a thin piece of leather under each contact point. I got the leather from a messed up jacket someone was throwing away, so my entire investment in the project was time. It helped a lot, but it wasn't everything. An old CRX should have some opportunities for you to find attachment points and make necessary modifications.