Take a look at mine at indoor its 24x24xI think 16 or 18 high it is 3/4 and 1/2 I think I would do all 3/4 sides if I was going to do it again with 1/2 only on the bottom just a little bit of bowing with rimless and 2, 1/2 inch sides. I think if you went 3/4 you could probably get 24 square...