Yes it is held together by screws however the 2x4's go all the way to the floor and to the top support beams, the weight is truly resting on the wood not the fasteners. My stand is capable of close to 3500 pounds. I wanted storage space underneeth but the cross supports at top and bottom kinda made that impossible. I had to relocate my sump,canister,co2
ect to the room behind the tank behind the wall.
That first pic is bottoms up, thats the bottom of the stand to show how the legs actually go all the way to the concrete floor.
I could have glued it all together but felt screws were easier to remove if needed. My verticle 2x4 supports are what carries all the weight of this tank.
id say close to 2600 pounds.
I suck at drawing on here and dont have my CAD programs on this computer but I think you could make sort of a shelf stand for this. using 45 degree cuts to attach the shelf to the wall then using maybe 4 4x4's at each corner, this would technically free the entire bottom up. Im trying to remember about 15 years back when we did the 90 in wall marine tank.