i will be building me a monster control panel soon for big people..

Just kidding!
There have been a couple of cabs made completely of polycarbonate, neither of which i particularly liked.
I haven't seen a cab with just a polycarb CP. The problem you may have is trying to blend the CP with the rest of the cab without it sticking out like a sore thumb.
If you want to go down that route I think you either need to carry on the theme with the rest of the cab (maybe have polycarb inserts in other parts of the cab etc) and/or you could just make the CP top out of polycarb rather than the whole thing.
What I would like to see is a polycarb CP with a CP overlay on which reveals the (backlit) polycarb in places to complement the graphic.
At the end of the day its horses for courses. If you think its a good idea then go for it, you the one who will be playing on it.
Good luck with it, I will be interested to see what you come up with.
