I built an Airboat years ago, but the thought of cutting wood etc, puts me off of another. In my shed, is a large sheet of Blue Foam, the sort used for Insulating Roofes, "Roofmate", High density foam. Just wondered, cut a slab the correct size, angel the bows, cut holes for battery and RC bits, make a frame for motor and prop, off we go. Pleasant blue, does not absorb water, any reasons why that shouldn't work?