Is there a specific reason you aren't using cheap plexi in your cab? I know I just have a cheap piece of plexi covering the screen. I paid for the more expensive lexan to cover the cp, because of drilling issues for the buttons, as well as much greater use.
It may not look as nice as true tempered glass, but the fact is that you should be looking through it, not at it. I am probably as anal as the rest of you guys about such things, but never have I got on my machine and thought "hmm, wish I would have gone with tempered galss instead of plexi."