Hi Philphy,
If you have a factory NAV screen with DVD brain in the rear side compartment then you will need to run the 5 meter cable which is the biggest pain in the Ar$e of the whole upgrade.
Crystalworks did a write up using the passenger side channel for his cable and my write up shows me coming up the driver side rear and then up the middle through the console.
Whichever you choose looks to be equally painful.
Mike