[Alan Anderson]

If you put your motor speed controllers inside the box, as they are in the one pictured, you don't need PWM cables to be run from the inside to the outside.

When we did an integrated control box on our Lunacy robot, we connected sensor wires from the outside using a DB-25 cable. We cut off the Centronics end of an old parallel printer cable and ran its wires directly to the encoders and optical sensors and limit switches, with only a couple of extensions needed. For development and testing purposes, we occasionally had the control box on the software bench with a DB-25 extension cable running between it and the connector on the robot.