Carbon fiber dash pad.

Awesome work! I need to get back into composites. I was originally thinking about doing this, but I was stupid and didn't leave the foam on my dash frame. Now I have a bare frame and I'm trying to brainstorm what I should do with it. I do have a vacuum pump and a roll of fiberglass in my garage.

Have you considered balsa? You can shape it.
Also, there is dense foam that you can glue on and shape.