This is the source code for the STL's on Thingiverse.
The code is horrible - and should not be used by anyone ;)
Unless you have the need, I would suggest sticking with the prebuilt STL's.
If using this, you may need to link in the MCAD library from OpenSCAD. On a Mac, this is stored at /Applications/OpenSCAD.app/Contents/Resources/libraries/MCAD. So to link it in, you would run:
ln -s /Applications/OpenSCAD.app/Contents/Resources/libraries/MCAD
Obviously update the paths to suit your platform.
The jotl-condition-tokens-tray.py code is not so bad should you wish to make some changes.