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that's another thing that seems odd to me, you could build the whole thing out of resin impregnated glass and keep it light but strong, proving the concept as well as possible, or you could use wood glue and a bunch of extra (and heavy) steel reinforcement.
with the resin, you can layer on all of your glass and impregnate it, then roll it out with the roller and if possible a wicking/absorbing material to aid in the process, and you would end up with an incredibly light, but strong structure.
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