Blender file allows for modifying the size to create your own version.
There are holes for 5mm x 2mm magnets
There are also areas for clips connectors. Clip can be found here: https://www.thingiverse.com/thing:2686090/files
Painting:
The author remixed this model.
Made complete set of 2"x6"x6" pieces to make a 18" x 18", 2" tall plateau.