I would love to do the foam board thing, but I am having trouble finding what I want locally. All I can find around here is full 4'x8'sheets. I would need 2 sheets, (1) 2" and (2) 3/4" sheets. It would be about $40 to make - more than I care to spend. Lowe's has 2'x4' sheets online, but those particular items they won't ship to store and will only deliver via truck. I'm sure that would be costly. I've even investigated other types of foam, from upholstery foam to floral foam, but they are all too expensive. The only thing cheaper is regular styrofoam, but I don't want those little bits all over the place. Any other ideas?