On Wed, 31 Dec 2008 10:32:58 +0000, a certain chimpanzee, TheOldFellow
randomly hit the keyboard and produced:

I've used light stressed-skin panels in constructions and they are
excellent in all respects. I would think a 12mm plywood skin over a
150mm core will easily carry a couple of guys jumping up and down - and
you get 150mm of foam insulation thrown in.

Like http://www.tek.kingspan.com/uk/index.htm you mean?
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Hugo Nebula
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just how far from the pack have you strayed"?