Why not use a 1U rackmount server as carputer?
since it's only 1U (aka 1.75") high, why not use one of those.
Then just use an inverter to power that thing and a startup/shutdown controller to controll the inverter.
would this be a good idea?
example:
SDR-1100T 1U P4 Entry Level Server
$529.80
Processor Intel® Celeron® Processor 2.4GHZ 128K CACHE 400MHz -Retail(1938124)
Memory 512MB DDR400 - Two Kingston® 256MB DDR400 ECC (RMS422 - 2PCS)(4358422x2)
Motherboard Supermicro® Super P4SCi Board (MBS409 - 1PC)(4832409)
Graphic Card ATI Rage XL w/ 8MB video(INTEGRATED-GC1)
SATA Controller SATA Raid controller onboard for Raid 0 or Raid 1(INTEGRATED-DC03)
Network Card Integrated Intel Dual Gigabit LANs(INTEGRATED-LAN01)
Floppy Drive None
CD ROM None
Server Chassis Supermicro® SC811T-250 (CSE-811T-260) Black Chassis 22.6" Depth [CSS619](1332608)
Optional 1U 64bit Riser card None(None)
Heatsink and Bracket Supermicro SNK-P0002 Copper Heat Sink [FNS404](1UP4fan)
Hard Drive - supports up to two SATA Hot-Swap HDDs Seagate ST3120026AS 120GB 7200RPM SATA(ST3120026AS)
Operating System None
OS Client Licenses None
Warranty 1 Year Depot Limited Server Warranty(SD-WR0018)