I do appreciate the input, it always helps future DIY projects go smoother.
the main support of the tank is the vertical 2x4's surrounded by the wooden frame then the ply wood avoids any chance of sway.
And I am open to hear possible better Support options, I just figured 6 vertical 2x4's supported by the framing were sufficient
. The nailers and facing is purely aesthetic. Except of course for the ply wood, that has 2 1/2" nails goin through to the support frame with the nails every 6".
I do appreciate the input, considering I am doing all of this off of the top of my head. I take it as help
that's the only way to improve on what you do.