The same as before, Bullet proof glass. 1/4" to be exact. I just picked up about 5 square feet last night and cut it this morning.
I was actually thinking about making some A-arms out of 3/8" thick material just to fool around. Should be cool. Not sure about the outcome but this stuff is strong and flexible. I would make a chassis but it flexes too much and I think the 1/2" stock would weigh more than the stock chassis.