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You could try metal studs (2x4s) for framing, and foam for the subroadbed. No need to put wood in the layout at all...? I think the cost of the metal studs is on par with wood, and even if not, you don't need a whole house's worht anyway. The foam is about the same cost as a sheet of plywood... <br /> <br />Interesting question - let us know what you find out! <br /> <br />Andrew
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