Here's R8 upside down on his neck, with the controller connected to the arduino and the motors over a Molex connector I harvested from my PSU build.

A close up of the "flying wire" perfboard hot-glue mess. Yes, the power cable is twisted, but only the colors, since GND is on the first pin of the pin header.

Quite helpful, a sheet of paper telling which pins from the arduino are connected to what or to what purpose.