In order to get him running, I had to get a temporary front foot, cut the front leg down to the correct size and secure it, and complete all of the wiring. The temporary foot is sized to scale with the actual foot and has two wheels on the bottom to allow it to move. It is made entirely of wood, except for the wheels and the screws holding them in place, and is wonderfully simple.
The front leg was originally 6" too long, and needed to be cut down to size. The cut had to be perfectly straight to allow R2 to move properly. Once the leg was cut, it had to be centered on the base of the frame. Because the base is partially circular and not precisely even on all sides, it took many measurements and critical eyeballing to ensure everything was lined up. Once it was lined up, I countersank the screws to allow the battery a flat surface.
Most of the wiring had been laid out by then, as I've been working on it on and off for the past few weeks. All that I had to do was actually connect everything and attach an Arduino and the motor driver. Then it was ready to go!