The way I have had my kit set up for the last 8 months is that I have the ground and negative cables obviously bolted to their corresponding terminal.
As for the ballasts, They sit on top of the headlights with most of the wires resting/running along the unibar where the hood latches. As for the relay pieces they rest on top of the plastic molding where it says "Caution Fan".
Anyone have better placement suggestions? Thanks