The goal is to reduce weight, and also reduce cost (drastically in comparison to CF). I was thinking diolen could be used, and if stiffness was an issue then carbon fiber strips could be used as reinforcement. Something like soric would be used as the core... just because it makes bagging a lot easier IMO. Alternatively Carbon Fiber could be used as the skin, but again... reducing cost is important and I would prefer to not go this route unless absolutely needed.