[DeTomaso] Lexan?

[Will Demelo]

Hey Guys.
I want to build a plexiglass intake box for my IR system. I want to duplicate what Goran has done to his. He hasn't got back to me.

http://www.hemipanter.se

Picture of box about 20% way down.

What type of plexi-glass should I use? Or should it be lexan? There will be heat and vibration, of coarse, so what is the best material? I'm thinking 3/8" thick? Can I drill and tap or will the vibration cause cracks eventually?
Will