I used 1/8" very cheap paneling, what you see is actually the back side. The front is a white painted wood grain but the back was plain mahogany. I didn't think I could bend the 1/4" ply on such a tight radius. I'm familiar with the fiberglass and resin having grown up at the beach in So. Calif.Repaired many a surf board. Trying to keep the cost down. Thanks for the input. It would be much stronger with the glass. I'll just have to be careful!