OK, I got the interface in and wired. Connecting it to the radio is almost painless. Figuring out where to route the cables, well that is the tough part. I decided I wanted the iPhone cable to go into the center console so I had to rip that out, and while I was at it decided it was a good time to paint the shifter bezel, and while I had the center dash trim and could get to the outer vents easily I decided to put LEDs in them, and I also decided to hard-wire my GPS into the RAP supply, and...
Needless to say it was (still is) an involved project. But the uPAC can be installed in less than an hour including taking apart and reassembling the dash if you're not pedantic about how and where the cables will be routed.
I have just a bit more work to do before the car is back together and will post some pictures when I am done.