Acrylic thickness for 8'x3'x2' plywood tank?

[Rivermud]

If you have firmly decided on glass (good idea btw as it's a pain to do plywood and acrylic) you will have a safety factor of 3.8 (industry recommended safety factor for glass) with 1/2 inch glass at 2 feet tall.

http://www.monsterfishkeepers.com/f...rmuds-Glass-and-Acrylic-Calculator-(it-lives)