Hey. I don't know much about android installs (have a windows 7 carPC instead), but you can try mp3car.com for lots of good info and plenty of tablet installs. Also diymobileaudio.com has a few really nice tablet installs.
Re audio: something like a minidsp ( http://www.minidsp.com ) might be good for improving the audio output pre-amp.
You could also possibly hook up a fan behind the tablet to help cooling if you removed the head unit.
Interested to see how you go. :-)
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