Posted a customizable thing: https://www.thingiverse.com/thing:3575705

which pairs with: http://chaunax.github.io/projects/twhl-box/twhl.html

allowing one to preview a design in 3D before committing to it.

For more on this sort of box design see: https://www.shapeoko.com/wiki/index.php/Carbide_Create:_A_Simple_CNC_Box which has a link to a video on designing and making such boxes.