I've recently played with Open Auto, a Raspberry Pi based Android Auto receiver setup... Open Auto has been built into "Crankshaft" which offers downloadable OS images. You can find their website here: http://getcrankshaft.com
For what it's worth, I've been playing with it for a while for a different project of mine (Since I removed the sat nav screen ages ago from mine, and also went double din)... but it works really well, and others have documented elsewhere how you can startup and shutdown the Raspberry Pi with the ignition. Basically, you could get a compatible screen such as the official 7" touch screen, connect it to a Raspberry Pi 3B+, then mount a USB connector somewhere and boom - you've got an Android Auto system
if you connected it to the factory head unit via Aux you could keep a pretty stock setup, and you wouldn't miss out on Sat Nav since you can use navigation apps within Android Auto.Worth a look if anyone is curious.
If anyone wants to donate me a BROKEN display unit (or has one going cheap) (Eg, the motor works, so opens and closes but the screen is dead) I may look to undertaking the project as a guinea pig and then if it works out, sell the setup on afterwards since I personally have no use for it.
Thoughts anyone?
Worthy documentation reads:
Boot, Reboot & Shutdown the Pi with Ignition Key
Getting Started with Crankshaft + Hardware Requirements
My test-bench is an RPi 2, so it's a little slower... it's better with the RPi 3B+
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