Sounds great for people that don't care about high end audio
Major drawback I see to tablets/etc are the lack of PCI card usage.
Until someone releases a REAL 8-10 channel USB sound card I will pass.
Why? Simple. The sheer fact that I built a $400 mini-itx based car pc that replaces $6000 in high end/pro-audio gear for my gear. Priceless.
A tablet would ONLY enhance the display for me, not the functionality or certainly the price.
What NEEDS to happen is the release of a real transflective/capacitive multi-touch display for the 12v market. My guess is these are or will show up soon via the OEMs as most cars are showing up with touchscreen everything now a days.
As for cooling/power/etc....If you can't figure that out how the hell could you figure out how to cram 10 lbs of crap into a 1 lbs bucket (i.e. customizing dash via fiberglass/etc for a "large" tablet integration)?? Answer: As the article states, by the time you paid (assuming of course YOU don't have the skills) to have it done for you, you are well past the price point of an "old" carputer with half the functionality imho.