...i need to figure out how to use planes for most part and only have the depth where its needed at the edges and corners where it would be exposed.

Im probably the least efficient modeler ever...a cardboard box weighing in at 32324 tris lol

Heres an inside look at the box...I had to find a box in the garage to find out how to fold it

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What I lack in skill I make up for with enthusiasm.