how much did u pay for the screen and inverter?

why are you getting a dc-ac inverter rather than a dc-dc adaptor? What about automatic SUSD controllers? Or are you going to turn it on and off?

Lilliput from hong kong = $280
or Jaycar touchscreen = $320 same as lilly....
Jaycar dc-dc = $100
SUSD controller $30
miniatx + p4 + ram = $150

everything for $600...

if you got an old comp lying around, its even less...just need to spend money on bondo for fabrication and some wiring...

$100 for full gps system.
$5 to integrate carpc into sound system

too easy.