After getting the Joycon installed, I also went ahead and ended up ordering a DCDC-USB, I had been having various odd issues and it turns out that most of them were a combination of poor power, and poor connections. I created a pigtail to connect to the DCDC-USB that has 2 female USB ports, one of them provides power to the hub, the other to the Nexus. Also running a Jabra Journey to route phone calls through. Charging rate is awesome, my battery typically gets to full during a single drive to work, and remains full all week long. Here is how the Nexus currently sits in the dash:
And here is a launcher I am working on:
It's supposed to mimic the RNS-E, so far it's not quite where I want it to be as I want to use %MTRACK to have a basic text of what song is playing, and not use the current widget. Apart from that though I am pretty happy with it.
Next things to do are to try and program a button on my steering wheel to activate voice search on the Nexus, possibly a back up camera and that's about it really.