TheRealMacDaddy;3279490; said:Another thing that crossed my mind as I pondered this is... At 84"x46" would 1 inch thick marine plywood bow at all (ie. will the back wall of the tank bow)
1" plywood won't bow if it's reinforced with the correct framing. You're going to need to frame it. You might want to search other plywood tank builds to get some ideas.