DIY projects

Hi,

I'm starting to plan a 240 gallon tank that I want to build. 4' X 4' and 24" high. Everthing I've read suggests using 1/2" thick Acrylic for tanks that are 19" to 24" high. Not sure yet if I want to put the overflow in one of the corners or as a center column in the center of the tank. It's going in a wall which will position 1/2 half the tank in my rec room and the other half in my den/fishroom.

My question....
Can you use a thinner thickness ...