Hey, so I am looking into making my own, and possibly marketing, trumpet cases. (weird for this website I know) So what I want to do, is have a shell for the case made out of some kind of composite material that is very strong, but also flexible (about as flexible as tupper wear) Then I would cover with foam and fabric... and make a case. So there's that... any suggestions on what kind of material I could use for the shell? I was thinking either fiberglass, though Im not sure if it is flexible enough, or I was thinking of Kevlar, though Im not sure if it is solid enough. So what are you thoughts on this? Thanks lots! Edit... I have done research on this around the web... and haven't really come up with anything that is useful to me. But I did learn how to make a subwoofer box, however that is to rigid for what Im looking for.