Fiberglass sheet is inexpensive, strong, and water-resistant. Working with it can be a pain, though, because fiberglass tends to quickly dull saw blades and drill bits. I have found that Black & Decker Very Thin Cutoff Disks work really well for cutting large holes in thin (.03") fiberglass sheet. That is the first photo.
For drilling holes, a 600-grit diamond attachment on the Dremel tool works as fast as a drill bit might. That is the second photo.
@otto9otto Thanks for the tips!
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