ive got one...
if you go to build on your own getting a shuttle xp case or some miniatx or microITX board.

you can do audio two ways, run it to an amp and run new wire from you speakers to the amp (night mare), or have a head unit that allows for a line in. easiest and if you ever decide you want to listen to a cd real quick, you can.

power..just get an inverter hardwire it in. ive got 400w and have no issues what so ever.

with the lcd screen, just keep in mind you also need to run a 12v power source to it.

if you've got any questions concernts ask me, im sure ive been through it. lol.