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I've used it for other stuff, and the main problem you have to worry about is warping along the length. Wood would do this less. Unless you were going to make a torsion box, which you'll have to google to find a picture, I think that a box would have warpage problems, unless you secured it to a horizontal panel to stabilize it. What you could do is use two 3" wide planks to make an L girder, and that would stabilize it along the length, but you would double the material and the weight. As for plywood, you would still have this warping problem. It would require extra work time to account for the warping, such as edge banding with a 1" wide wood strip. This is just my opinion based upon woodworking experience with these materials. I have been considering pallet wood, scavenged from thrown away pallets. Less warping in my opinion, but does not have a nice finished surface. You could cover the apron with 1/8" hardboard for a finished look. John
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