Hi,
Finished in Australia day. I don't have heated seats and the Powermagic needs two inputs, 1. constant power and 2. ignition power. I ended using fog lights for constant power (fuse 29) and accessory power outlet (centre console - fuse 13).
As for the cable to rear cam, I used a snake and run through the roof lining. worked really well. From the run in the existing conduit and under the rear window upper plastic cover. excess cable is near the centre ceiling light.
powermagic and front camera install;
attached with double sided tape, it is accessible if I like to turn it off
all excess cable is tucked away above that white plastic bracket
Power cable was run in the driver side pillar. very easy to remove. snake the rest of to the centre of the ceiling. well away from side airbags. the cable was attached to existing cable using electrical tape to make sure it doesnt' get tanggled.
Finished job.