Electrical Box Twist Model

This is my second attempt at understanding the operations in OpenSCAD.
I made a model of a 4" square electrical box with a raised plaster ring in AutoCAD and then exported to an STL. I couldn't get emmett's heart gears file to work, so I basically destroyed the original cubeGears3 code http://www.thingiverse.com/thing:10483 until it didn't work either. I rebuilt it enough to get the result I was looking for. I made both the Gear1 and Gear2 module accept x and z rotation inputs (1 or 2), and then added some rotation code inside those modules, the twogears module, and the assembly module to make them behave for a non cube object. I added an object module that loads a custom stl file and orients it for gear mashup.

I am still not clear on the way the relationship between the overall model, the center and pins is determined. I cheated and just tweaked the center cube until it looked like I wanted, and then I measured the necessary pin length and used the Pins library to make one.