Customizable box with customizable dividers

This is a remix of the "Customizable Case (Compartment)" by @walter. The aim of the remix is to make possible to "merge any compartments" of the box.

The solution is based on the concept to represent each compartment of the container as a cell of a matrix cell. The correspondance between the SCAD matrix variable's cell indices and the compartments row/column indices are described in the code and on the pics.

NOTE: the main value of this "thing" is the OpenSCAD file, not the particular STL I supplied as an example. Download OpenSCAD and use the file to generate your own customized STL.