[Gdeaver]

It is not hard to laminate a layer of s2 glass or carbon fiber to a sheet of 1/4" plywood and gives a very strong and ridged board for your bottom. We planned on doing this for 2010 but the design did not allow for it. S2 glass is a value solution and is almost as good as carbon for this app unless you get some areospace grade carbon. A good grade of birch ply works well.