At long last I've finally got my system running nicely.
Here are a few pics from building it:

My Car:

More Pics:
http://www.folken.net/albums/vwgolf1/

First System (HD controller died after 1 day):
VIA EPIA EN15000G Motherboard


Second Try (Had Major Heat Problems):
Jetway J7F2WE-1G5 Motherboard


Final System:
VIA VB6002G Motherboard with Pentium M 1.6Ghz






Secondary Battery:


Screen:


You can see more pics here:
http://www.folken.net/albums/computers/carpc1/

Here are the main specs of my final build:
StreetDeck North America 1.1.0.0
Intel Pentium M 730 1.6Ghz
Via VB6002G Mini-ITX Motherboard
1GB PQI DDR2 667
Sound Blaster Audigy SE 7.1
Hitachi 2.5" 80GB 5400RPM SATA
Panasonic CW-8124-B Slim Slot Feed DVD/CD-R Combo Drive
90 Watt M1-ATX Automotive PC Power Supply
Home Made Sheet Metal Case
Lilliput 7" VGA Touchscreen 619GL-70NP
4 Port USB Hub
BU-353 Weather-proof GPS Receiver
Senao NUB-362 200mW USB 802.11g Wireless Adaptor
The rest can be found here:
http://www.folken.net/carpc1.html

I'll get final pictures up soon.