Each of the modules can be stacked to make a flush fit.
Each module is made up from a combination of these four components.
An example of a stack. The units could fix together with some type of doweling or fixed screw metal plating.
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Tetris Storage Solution

A 'retro-throwback' modulated storage design. designed to be simple and cheap in production.

Shaun Rhodes
Shaun Rhodes Derby, United Kingdom