plywood panels attached to 2 x 4's level?

[fish4me]

For those that have framed the outside of the tank with 2 x 4's and then screwed in plywood panels on the sides and back........

I am guessing that it is not a major concern for the panels to be completely vertically level.
In reading threads on the forum I have not seen much mention about the necessity for these to be vertically level, but instead just that the tank sits perfectly level on the bottom.
Most plywood has some warping so I know it is not perfectly flat from side to side.

Just wanted to get opinions and make sure I didn't need to go back and redo all of the 2 x 4's to compensate for the flex in the plywood. I tried to get the 2 x 4 studs as perfectly flush as possible.
I am going to be coating the plywood with Permadri pond coat.

 

[nolapete]

Square is more important than level in regard to tank construction.

Level is most important in regard to the top of the stand the tank is going on.

In a perfect world, the two go hand in hand.

Build your tank square. (Do yourself a favor, buy a speed square. You'll love it!)