[PAR_WIG1350]

As for motor controllers, 24V victors (VICTOR-883-24/24) from IFI would work, but you would need one per motor.

In addition to motor controllers, a micro-controller or other main controller should be used. For this the Arduino family of controllers would work. It offers I2C, analog, and PWM communications. However, 24V is too much for it, so a separate power supply might be needed.

Alternatively, You could 12 volt motors with 12 volt victors (VICTOR-884-12/12) and that would reduce the complexity some, but I don't think CIMs can match that performance.

It is very possible that four CIMs, Four Victor 884s, and 2 AM tough box minis cost less than two NPC-T64s and two Victor 883s, while retaining acceptable performance. But this hasn't been confirmed. I think that it's worth looking int though.

EDIT: The Victor 885 might be a better match for the NPC motors.