I decided to make this system the simplest way I know how without any soldering or special tools.
First cut out a piece of quarter inch wood and sand it down until it fits snugly inside the glove box. You want a snug fit so there is no need to glue or screw it in place.
Step 2: The face panel
Now cut holes so the USB keyboard and screen have a comfortable place to live. to keep the screen in place i just used a length of wire. This will allow the passenger to alter the viewing angle. Staple, glue. or tack a thin piece of plywood behind the hole for the keyboard to keep the keyboard from falling through. Make sure you cut a finger notch so you can remove the keyboard.
Step 3: Plug it in
Then plug it all in. At the moment I am using a 9 volt battery to power the screen because I'm not sure which car it will be in. Once I decide its permanent place I will wire it to the fuse box. I am running the Raspberry Pi off a USB car charger in order to keep the build simple.
Step 4: Enjoy
Place the face panel in place and enjoy. At the moment I am running Rasbian, but i think I will switch to Raspbmc. If you don't know how to mount the OS to the SD card I would suggest watching a tutorial on YouTube. This is only meant to be used by the passenger, never by the driver.