A person that did this was featured in MaximumPC about a year ago. He was using a regular setup, not a mini mobo, and he had placed it in his glove compartment. He had the cars AC venting onto the motherboard to cool the components. He used a 15" LCD mounted on the dashboard between the driver and passenger seats. Then he used a mouse with the ball on top of it, as a way to control the system. He used it mainly to watch DVDs on car trips. I haven't seen any guides for doing this but if you do, be sure to post some pictures
