fredsheldon wroteThe custom hand made IOM's are Fiberglass, and very breakable, and the smaller kits are the same material as PVC pipes, very hard and almost unbreakable.
This is really intersting to me, I work in boats (started off in yachts) and my pipe dream is custom and small batch composites molding and casting of vehicle parts (boats, motorcycles, cars, etc,).
I'm probably a year off from the capability(CNC routing), but if you ever want to try a custom design I'd be game for making that my test project. I have a commercial account with a composites distributor so I can get virtually any material, and would be able to produce fiberglass, carbon fiber, or any typed of poured resin including additives and pigments.