Im thinking about converting this cabinet into a baby rack. My problem is the dimension of it arebt lining up with the tubs ive found at practically every store. Its 21.5" wide x 13 deep. Ive found tubs that could fit but not as flush as id like. For example: 3 sterilite shoe boxes are too wide. 16qts were too deep.

I was thinking about using 2 shoeboxes per shelf in the arrangement shown on shelf one. I would have to put a backstop on the left tub to keep if from going all the way back.

Question is are there any place online that make custom sized tubs? Or us there a combi ation of different sized tubs that would work (like 1 big one small on each shelf)?
0.3 normal bp, 1.0 albino bp, 1.0 lesser bp, 0.1 spider bp, 1.0 jacksons chameleon, 0.1 veiled chameleon, 1.0 pit bull doggie