Cool project! I think I'll do sometime similar on my SD60.
One comment though... That second picture makes me nervous. I've have problems with those sticky-tape wire clamps before. I'm afraid with all the vibration, bouncing, and some heat that they'll let go and the wiring will fall into the deck belt. I'd recommend running them up along the frame rails and securing to the existing holes (you can see one in the pic on the left) with zip ties.