This is my home-built case. I call it the Breadbox. Most of the material is from HomeDepot,Lowes,Ace & RadioShack etc. I made the cover for the psu & air filter out of some scrap stainless. I covered the psu out of concern that the hard-disk was so close to it. I don't know if it's really needed but I don't have any EMF data corruption problems. The filter is for a lawnmower, had to cut the paper away because it is WAY too restrictive. The rubber seal on the top is cut from a garage door bottom seal. The drive mounts are plumbing pipe hangers.
http://photobucket.com/albums/y220/caryncc/