Thanks mate. Maybe in time I'll get a naturally aspirated V8 XF. I miss that V8 bubble. The XFR brakes were too big for me to put smaller wheels on with higher profile tires so that won't work here. But I've been looking 😊
One way to hide the cable would be to put a strip of black tape along the edge prior to fitting (obviously not applicable if your car is black). That way once installed the narrow strip of white paintwork will no longer be visible and hence you won't see that tiny bit of cable.
Excellent point about tapping into existing lit buttons. That means the cabin lighting brightness control should also control the brightness of all the mods (if dimable).