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- #21
Glass should work for the film?The substrate for the balsa doesn't have to be too flat, just stiff. I use floor tile cut to size and balsa or PVC foam under the tile to make up the thickness.
For the films, I again used tile with balsa under and glued some 6mm thick acrylic from eBay onto the upper surface. It's all in Annex II & III of the instructions, even where to source the 0.1μm in AU.
Can get a piece of 10mm glass and glue foam on it easy...