Oh I completely understand how something hollow with less mass can be stiffer than a solid depending on materials and configuration, Carbon fibre box section can be much stiffer than steel solid. Would you have any nomex offcuts that you could post to me (I'm happy to cover cost) and I will make up some beams and defection test them. If you can't I will look for something around here but then I have no idea of the glue technique and may not get the results you would get.
Jim
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