
I wouldnt use 4x4. I would either weld up a steel frame and skin it with 1/4" ply and trim it all out or make it using wood such as 2x8 top frame and 2x6 lower frame and 2x6 vertical supports. There is a thread on RC that will be a huge help. You may be able to avoid using a center brace if you use a 2x8 top frame..
Great tank, best of luck with it. Considering $ is issue i dony know if you could pull off the steal stand. Site fishandtips has stand plans, might be worth checking out. I think the homemade stands are sturdier, but thats my opinion only
