I agree with @ShutterShock and @ZachTetra, acrylic is much too brittle. Polycarbonate is a much better choice but still might need a verrrry thick wall to not crack at bolt holes and other stress-concentrating locations.
It’s a transparent ceramic with about a 1/3 aluminum content….hard as hell, great for armor and crazy durable windows (for sensors, etc). Used instead of sapphire windows in some applications.
As far as realistic options, polycarbonate, a simple sheet of it, with loooong bolt holes that run all the way through the height of the enclosure, could work.
Spaceship windows are the only use I know of off hand. Lots of cool materials in that field. Haven’t got a clue what we’d use it for in a board, but check out aerogel, if you haven’t seen it. Mind boggling.
The whole “it can rest on a flame” thing is what gets me.
Personally, Ive been wondering about a very thin, 3 layer enclosure. Steel, sandwiched in fibreglass or perhaps a plastic or very durable rubber.
not only heat resistant, its also strong but brittle at the same time, u can break it using ur hand, but it can also hold up hundred to thousand times of its weight. u’d think there is no way it can survive any impact, but it can stop a 9mm going through with a thickness of only 10mm