[FotoPlasma]

When rotating the module, I think I can see how the wheels would turn without being driven.

Is the motor going to be mounted vertically above the module?

With four of these, it's possible to use multiple motors to drive the wheels of multiple modules.

I can see a lot of different combinations. You can have multiple drive motors for 1, 2, 3 (not sure why you'd do this, but it's possible), or all 4 of the modules. The same goes for the rotation of the modules, either linked or independant.

Very interesting setup, to say the least.