I am in the process of rebuilding my interior of my larson open bow. I have designed how i want my seat to look and now i am picking the materials for the bench seat frame. Instead of using ply, i have played with the idea of using 2" thick foam pink sheet, wrapped in several layers of fiberglass with epoxy resin. My main question is would this box construction be strong enough to be a seat frame, or would it be too weak?