OK, you need a couple of items besides the Motherboard/PS/ITPS + HD.
Speaker Boxes:
http://cgi.ebay.com/ws/eBayISAPI.dll...&category=3292 $9 dollars for two + shipping cost.
Plexi glass: 11x14 inch sheet, score with knife and snap in half $2 dollars.
Cool LED fan: Any brand $5-10 dollars.
Tools Needed:
Skil saw and drill.
First the plexi needs only 1 large hole for the fan. I used a 8cm holesaw in reverse to cut the hole. Made 4 small holes so the fan could be screwed into the plexi.
Then made 4 holes in the corners for screwing into the box. Use the drill in reverse!
Next comes the box.
Using a Skil saw or similar.
Cut the top rectangular to the size you want. You can place tape along the box as a guide. Then cut the back bottom half open in the back.
Screw in the motherboard, Velcro in the HD sideways, and screw in the ITPS etc.. Wire it up to a lit switch like mine if youw ant to signal the ITPS is putting out voltage or to keep the PC from booting.
And screw in the fan and then pop the top on, and your done. Put it in the corner of your trunk with some Velcro on the bottom.
I hope that helps.