Muck's right, you don't need 1/2" acrylic for baffles. That will cost a fortune.
Go with glass. Securing acrylic to glass can be fun (by "fun" I really mean "not fun"). It's far easier to secure glass to glass (using silicone). Silicone sticks really well to glass, not so well to acrylic.
Cut glass should be cheaper even if you get it at a glass shop, but if you can find scraps or whatnot you can probably do it for a pretty minimal price. "Clear float" is I think what you want to look for (aka "standard glass"). 1/4" or 6mm should be OK. I would think that for baffles since they're not holding water back you could get away using 4.5mm, although I myself have always used 6mm. Maybe someone else can comment on using 4.5mm for baffles..
Anyhow just my $0.02.. Good luck!
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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