I may have a contact now for some thicker .78" "bullet resistent" polycarbonate. Won't know until this coming week. Portions will be small as what I'd get will be the "waste" from a security installation job. But then that is how I got the 1/2" as well, scrap. Proves the old saying, "One man's trash is another man's treasure."
Just love the concept of having a bullet proof waterblock.