Longshot but I gotta ask

Does anyone have the schematics/exact dimensions of the interior bases of the rolling 2 drawer, regular 2 drawer, and 3 drawer? Just purchased a stack along with some gym mat foam and was hoping to make my own inserts. I know there are companies that make them like Shadow foam, but a single insert costs $55, but I got more than enough foam and exacto knives for $80.

Thanks in advance for any advice or help!