If you take that fome-core idea to the next level and use something like 1/2" Gatorboard
you would have something a bit stronger, inert (relatively archival), and also easy to assemble. More expensive than regular fomecore, but stiffer and more moisture resistant
too. Art stores sometimes sell flat carrying cases for big prints made from lightwt corrugated styrene which is relatively safe and cheap. They're generally black and have velcro closures. Retail art store markups are generally obscene; but this is something you
could obviously shop around for, or simply copy by buying the bulk sheets. I can be glued
with any conventional styrene or model cement, and isn't difficult to cut - a fraction of the
price of honeycomb acrylic or polycarbonate.
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