I am interested in your design. I bought a Guy Takayama foam/ carbon hybrid. A lot of Fun. Some flex. It had a problem where it could not be in the sun over a few minutes without causing damage and a rippling of the bottom glass so bad fin box took on water. Are these less heat sensitive or do they have to go into a sun protective bag immediately after use? Also epoxy boards are insufferable to sit on for any length of time without hurting. Anyway thanks, I want to know about hi temp(being in the sun?) resistant surfboard structure.