Looking to build my first plywood tank!

I am moving into an apartment in about 3months. i cant have a 120xh like i wanted and was hoping to build one that has similar dimensions.
i have severums, i was hoping for a longer tank than my 75gal. and well i would like something a little longer, taller, and maybe wider.
i tried seeing if there was ways around the rules for a bigger tank but the 120 is to heavy. so i was thinking of somewhere along the lines between 75-90gallons for the apartment. i just have no idea where to start with dimensions or what would to use, where to get glass, etc...so could you guys please help me out? id hate to re-home my severums and i am aware they can't all come along. i would like to keep some big fish as i have never done so, the sevs are my first.


Pockets

What ever will best accommodate my severum and maybe some earth eaters or uaru. I'd like to do a south American set up


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The height of my 75 is fine I think. It's 21" inches. My concern is the length and width. I want it wide enough so my fish can comfortably turn around and long enough so they aren't bumping into each other.


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