Wiring preperations
I believe most builders have had similar questions, and the designer (Van) has done a great job of providing adequate drawings and instructions to assemble the airframe and most system basics. However, wiring an airplane (or house,ect.) is very much a "customer choice" option.My advice, and I have re-wired many certified aircraft, is do decide upfront where you want lights, what type and power requirements they have ,ect.,then put the wire runs where they are easiest. If you cant decide, go ahead and put some holes/grommets in place and pull a string through them and tie off at the ends. This way, you have a way to get the wires through later, or pull the string out if you dont need it. Small light flexible conduit with a string is even better...come back later and add the stuff you want. Bottom line in your case if no elaborate lighting/cameras are ever going to be needed, no wiring provisions are needed while building the VS...they go out the bottom and into the lower fairing for the tail light.
Bill E.