Default Building a car head unit

So I've been looking at the various android car stereos and realising all of them have serious problems (Shame the manufacturer won't just open source the bloody things).

But I recently read about AMD's new systems on a socket and wondered if it would be possible to build a dual booting android and windows head unit. You can pick up a Sempron 3850 and micro ATX motherboard for under 70 (which covers CPU and GPU). I must admit I'm interested in a 1080p lilliput touch screen, then need to add the usuals such as a wifi + 3G/4G dongle, TV/DAB Radio tuner and a GPS unit. The only real joy that I can figure is how to mount the thing. The number of double din units is severely limited. I found this one:

http://www.amazon.co.uk/Bybyte-Doubl.../dp/B0076PF92Q

But it doesn't look like you can stick a dvd drive in. Ideally I'd like one that I can slide the screen out the way and stick a DVD in but the number of double din car stereo cases is pretty limited.

So has anyone done anything like this? Am I mad or does this seem like a good idea? It would be great to be able to dual boot android and windows 7/8 on such a beast