I am in earthquake country, but that wasn't really the reason for that design. I just wanted it to have a solid look. Of course it would have been stonger and cheaper to use 2x6, etc., judiciously placed. Actually I think the best thing for earthquake prep is to put a strap around the top of the tank and anchor it to the wall. The top is 57 x 34 inches, but I won't use all of that footprint just yet. Don't have the tank yet. I'll make it out of 3/4'' acrylic, though. There won't be any equipment under the stand, so I wanted it open. Yup lotta bottles...
G1