Back to this thread to say I have abandoned the Nexus install for now. Primary reason is that I needed bluetooth pairing with my phone for calls and I could not find a nice way to integrate an external mic to my Nexus. Instead, I have purchased a (chinese) Pumpkin 2DIN head unit, which gave me all sorts of headaches until I was happy with it. Printing a custom bezel now, as it leaves some gaps from the OEM bezel. Still miss that clean and simple look of the Nexus though, as well as its' reliability (Pumpkin shuts down due to overheating too often for my liking, working to resolve this as well).

Most probably I will start a new thread with these adventures for anyone that may be interested. Also, if anyone attempts the tablet install, give me a shout, may be able to assist somehow.