diy plywood aquarium

Hey guys I'm new, like really new. I've been reading everything I can find on diy tanks. So my understanding is that volume of water doesn't really factor in to force on the sides of an aquarium. So my question is this if I have a 55gal aquarium that's 20 inches tall and I cut it apart and use...

Pretty excited I am just finishing up my diy plywood aquarium build!!!!Can't wait to get water in it and get the filter cycled. Got a 9 inch Datnoid and a jack Dempsey that are going to love there new super sized home.planning on some silver aros, and some pbass, maybe some nice shuvel cats...