Putting this thing as your CarPC is underkill and definitely not worth the amount of work to get it "on par" with a Mini.
However, getting the OS off of it, and using the SDK to build a decent touch friendly front end would be the ultimate goal of anything iPad/CarPC related.
The dev kit for the iPhone must be easy enough to get 140k apps, so the iPad SDK should be just as easy. I cant speak for any developer here on MP3car.com/maccar, but I wonder if the OSX dev is a hurdle this can make easier to surmount by going iPad and not OSX operating system.
Again, please dont imagine this thing BEING your CarPC as to why I started this topic.