Plywood build

[viper0397]

I am wanting to build a plywood tank possibly 10’x4’x30”. Just wondering if any of you have built a tank that size and if so would you be willing to share your design with me? Could go 8’x4’x30” as well. I just want to make sure I build it sturdy enough. One of my questions is will doubling up the plywood be effective? Bracing is also something I am concerned about. Just looking for advice.
Thank you in advance!!

 

[Niners4952]

I build a 8'X4'X32" I used 3/4" birch plywood and braced with 2X4 since looks was not important, no need to double up on plywood. I used pond shield to water proof, I have good wood working skills not a pro but thought it was pretty easy. Watch Joey's the king of DIYs videos