Rob

I installed mine about 3 months ago..hardest part was finding a switched power supply but in the end drew it from heated seat switch.
I found it much easier with the sat nav removed from the dash to route cables.
I put the Origin on the left of the steering wheel (UK car obviously) and sat the GPS aerial just behind it so its almost invisible.

The panel below the steering wheel does come out with a bit of convincing.
Noticed your in the midlands...me too...nr Wolverhampton so if you need a hand and are in the vicinity then I'm happy to help.

Thanks
Steve