I had a hard time customizing the box, so I took most of the ideas and rewrote the OpenSCAD code from scratch. (And learned a lot about the limitations and undocumented parts of the language...)The holes are now defined inside a list, so you don't have to define them twice. There's still some features missing from the original.Determine the size of your package, and where the holes need to be.Modify the scad file.If the box is too big, you can generate just the top or bottom (GENERATE_{TOP,BOTTOM} variables), or have it render with both halves put together (STACK_HALVES variable).