I bought the wiring kit from Van's thinking that it would help--it did to a degree. I received some heavy duty wires for the battery and starter plus a few other goodies that were definitely a good value.
The schematics that were included would be great for a simple airplane, but mine is a lot more advanced. Nevertheless, it gave me a nice starting point.
I'm leaving quite a bit of extra wire at each connection point--maybe too much. For now, better safe than sorry.