Ok so i've tested and it did not apply the mask or the overlay.  i tested it using a pose file that runs the python.py, and also tested it directly launching the python.  i'm not getting an error but no overlay has been applied.

EDIT:  i didn't read the fine print close enough lol... gotta mess with the shader nodes... hopefully ill get it working :)

 

OK one final question after some testing lol... the instructions say to disconnect the diffuse and specular nodes... but that erases the texture; and i'm trying to overlay the texture not erase it.  It looks like your script should be doing all this automatically but i still see nothing happening.

When i followed the commented steps manually all i come up with is trashing the material (torso in this case) and it's not showing the underlying texture, because i deleted the nodes =P