I considered doing that in my new car, taking the tablet apart, but part of the nice thing about building a system around one of these tablets is the benefit of being able to easily eject it. I agree that some sort of hardware is needed to support the tablet install & in this case combining it with a headunit seems to be a good idea... I choose to do this so I can easily retain steering wheel controls, am/fm & cd changer etc, & also as an easy way to interface my factory optical input amps & also on the odd occasion I happen to not have the tablet I still have a somewhat functioning system. I'm lucky though that in my system I was able to just move my headunit back enough to mount the tablet in front of it & leave exposed the buttons I'd need to switch source and also that in this car the radio info is repeated in the instrument cluster, so even when the tablet is docked I can still see & control am/fm & cd changer function throught steering wheel controls & cluster display. I'll also make this on in a way that when the tablet is removed the radio itself still looks good & is still useable
what would be truly awesome would be some sort of supporting hardware that would get installed in the car & then connect to and be controlled by the tablet, kind of like a server for the tablet by either bluetooth or even wifi... I plan to add to this system with a media server to serve up media &/or I'm also considering a simpler pc install that can be controlled through remote desktop with the tablet. here's a peek as it's under development...