sorry for going OT on the OP thread.
rimless using 3/4" glass for saftey reasons. The taller the tank, the thicker glass is needed. My 60x30x23" is 3/4" starphire glass. Heavy as hell. 3/4" starphire is a lot more expensive than 1/2" as well. Tallest they will build is about 24" too.
Eurobraced, you could go 72x36x27" without issue on 1/2" glass. Marineland 300DD is 1/2" glass.