You might as well go find a pile of sand to pound if you were hoping to be the first person on the planet to install an iPad mini into a car dash. It's already been done, just hours after Apple's newest tablet went on sale, by the folks at Soundwaves of Tampa, and they have a handful of pictures and a 3-minute YouTube video (embedded below) to prove it.
The iPad mini is arguably a better option for car dashes than the regular iPad, both because of its smaller size and also due to the fact that it's the least expensive iPad model you can buy, save for refurbished units.
A couple of fabricators at Soundwaves of Tampa rigged a custom dash in a 2012 Toyota Corolla before the iPad mini was released. Once they had the tablet in hand, it was simply a matter of sliding it into the opening and pushing the dash back in place. The neat thing about the design is that it would be super easy to the remove the iPad mini if it ever needed serviced, or if the driver wanted to replace it with a newer model sometime down the line, provided the dimensions don't change too terribly much.
To go along with the iPad mini dash, Soundwaves of Tampa installed an Audison digital system with a volume control module located below the automatic shifter. It's a pretty sweet setup, at least until the driver crashes into his or her data cap.