Personally I think that removing the bezel from a tablet is doing yourself a disservice.
As has been discussed ad nausem, tablets have limitations that many "traditional" carPCs do not. Of course, they also have benefits over those same carPCs, including startup times, ease of installation, bright and responsive displays, and (IMO the biggest one) portability. You can build the best ever carPC, but it's just that - a computer in the car. A tablet has the unique ability to leave it's carPC shell and travel with you into the house, on a plane, at the office, etc.
In this way, a tablet carPC is also an incredibly inexpensive option, as you already have the tablet for uses X, Y, and Z. By paying relatively little to retrofit your car to "tablet-ready" status, you've got a very decent carPC solution.
Removing the bezel (if even possible as Cesco noted) kinda smashes our ability to do this, and kills a lot of the inherent benefits of a tablet carPC solution in the first place.