fragbox, it's a small computer utilizing only one 5.25" drive bay, it's made for lan partys and such. but i has a handle.
you can find small form-factor boxes online at stores otherwise.
tie it in means use VGA/ dvi support from the monitor. remember, when making something you dont want to create all new technologies, i'm sure that it is just a form of composite/ vga/ dvi that they used
to me this entire project seems like somthign that is never going to be useful, and is just going to be a pain in the a**
having a monitor in the dash that is 7" or so and tying a computer inot it, you'd have to have the passenger control it if you were to use a mouse/ keyboard, thats why i suggest the use of a pc and a touch-screen interface.
and have the box up front? you might as well have it in the back and run all the wires up front.
patch up an IDE cable and then run the DVD rom/rw drive into a DIN and use that at least.
I have heard of many computers being put into the trunks of cars for the use of MP3 playing in cars and as the car stereo, but i'm not sure how they were controled.
don't flame me, i know what i'm talking about and this just seems like it would be a giant mess.... tho i mus admit, it is tempting, it will be to hard to do to take any pleasure out of when he's done