I've read about people putting counter-top laminate (Formica) on the inside of the centerboard trunk to give the centerboard a nice, slick surface to rub against. I've been giving this some thought. The laminate would be cut so that is a little smaller than the area left by the blocking strips. I'm thinking the laminate would be pressed into the final layer of epoxy before it starts to cure, and then weighted down.
The blocking strips would have to be milled slightly wider, i.e., 1" plus the thickness of the laminate times two, to allow the proper clearance for the centerboard. This would make the trunk slightly wider, but I don't think that would cause a problem.
I had thought of using thin sheets of plastic instead, but am afraid they might not stick to the epoxy. The rough masonite-like surface of the underside of plastic laminate should stick very well. I would also make sure epoxy seals the edges of the material, which might be porous.
Any reasons I have not thought of that would make this an absolutely stupid idea?