Game Card Holder (configurable/SCAD)

I just drew these in my office at lunch. I'm new to scad so I'm sure there is a healthy number of bugs. Seems to work out well during my test print though.

This is a redraw of the Game Card Holder thing by condac. I've migrated them to open scad so they have some configuration options.

These include:
1. resizable for different cards
2. choose which tabs/slots to add (make a 2x2 block, avoid dangling tab on end or whatnot)
3. [simple] lid and adjustable walls to make deck box

The l