This guy has great videos and was a lot of the inspiration on HOW I built mine, not the design but the methods for sure! https://youtu.be/XM9Tzu5NlsQ that specific video shows him mounting the screen and plexi I think.

Here is the Amazon link of the plexi I used:

https://www.amazon.com/Lexan-Sheet-Polycarbonate-Thick-Poly-X/dp/B088K5BLKY