Here's what I found....
A 6.5'' Slim LCD
http://www.crutchfield.com/S-xt231bN...-TME-S370.html
Here's how it looks on an X1:
and on a 1 Series:
Here's a video on how it works:
I would probably just mirror my jailbreaked iphone using the RCA cable for Maps and Movies and send the sound through the 3.5m jack (although it will be sweet to connect the thing to the LCD and use the steering wheel controls for the phone)
Anyways how hard could this be? thoughts?