After the holes were drilled, I began the wiring. The first things to wire were, of course, power and ground. I ran the wires through special holders on the back of the board that let you easily zip tie the wires close together and allow your board to be more organized. Then I brought them up through the holes, which were positioned directly in front of the boards they were to go into, and put them in the screw terminals that I added to the boards to let me connect the boards with ease.
When the wires were in place, I tested them to be certain that I had not accidentally swapped any of the wires with each other. If I had, it could ruin the board that they were connected to. Fortunately, all of the wires were in their place and R2 was ready to go!