Houston we have a problem. What your doing is a good Idea, however you have now created an un-balanced board similar to the current Tornado playing surface. I suggest you glue a 1/4" sheet on the opposite side to balance the board. What happends is as the glue cures it draws towards the center, thus creating a concaved surface. It may be that the board will not cup severely, but either way would you let me know how it turns out?