Cable in through the rubber, camera mounted on centre of window, wire run through top of wardrobe and down through lighting panel above fridge/cooker, etc..
He'd never done a Cali before, so took the trim panel partly off the back door and removed the blind, somehow the blind got damaged in the process. Oddly enough he then realised he didn't need to remove so much trim or the blind. Expensive lesson, but he still did a great job for his first Cali. He was also the only installer that I contacted who would tackle the rear camera installation.
Dealer has quoted replacement blind at £130 plus vat, with installation quoted at £197 plus vat.