Terrance,
I wouldn't do it. Having tinkered with all sorts of carputers, and used many different types of computer in the vehicle itself, I don't think you'll ever be satisfied with the result. Sell what you have, and purchase something used from a seller with a high volume and a lot of positive reviews. Surf around and see what some of the latest touchscreen UMPCs cost too. I think you'll be pleasantly surprised.
Also, you don't want a pen/stylus based input system. In the car, you'll want a touch screen that will allow you to use your finger for control. The kit you linked to is touchscreen, though I don't know how good it is.
Craig
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