I had a plastic box with a handle. one day i was in my room looking at all the crap i had and i started to plan a mobile (not laptop) computer. So i got some of my small parts, the box, a marker, and my dirty old soldering iron. i just marked & melted and got it all to fit.
it had a 20 GB HDD 256 RAM 600 MHz Celeron Windows XP PRO Wireless G (inside the box!)