I've been thinking about a clean way to add a car computer to my 2001 boxster, too. My current thinking is to take one of the Asus EEE laptops and put it in the shelf for the owner's manual. Surprisingly enough, it has the same dimensions as the shelf. So I think it would work. If I ever wanted to remove it, or upgrade to another UMPC or laptop, it would be easy to replace, too.
For the display, I am debating between a 1DIN touchscreen that folds out, or a 2DIN touchscreen. To use the 2DIN, I would have to remove the DSP unit. I'm not sure how hard that would be, but I don't really care about the DSP unit, as long as the factory changer still works without it...
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