Spirit Island Insert: base game, 1 box, extensible

This aims to be an extensible insert, using the available space in the box of the base game as efficiently as possible. In the pictures, it holds the base game plus four additional spirits and there is still plenty of unused room for additional content from extensions.

The original FreeCAD file has a template for new boxes. To create a box consistent with the other boxes:

• start with a copy of helper-stuff/box-template

• modify the sketch to change width and length

• modify the pad to change height

• helper-stuff/dim contains some useful dimensions like the available room inside the currently empty brown box (already accounting for 1mm of clearance)