This is a home theater PC I built from mostly spare parts. It was designed to be as compact and quiet as possible, given the parts I used, and also not look intrusive in a living room setting.
Step 1: Components, Tools, and Materials
First of all, you will need all the hardware required for a fully functioning computer: A Motherboard, CPU, RAM, Video card, Power Supply, Hard Drive, DVD Drive, and an cooling components.
To build the case, you will need:
1/4" sheet of marine mahogany
3/4" sheet of birch veneer plywood
12' of 3/4" aluminum angle bar
"L" brackets and screws
Lots of machine screws and nuts
Scrap of sheet steel- I cut mine from an old CD player
Perforated aluminum sheet, "Modders Mesh"
2 large momentary push buttons
Step 2: Building the Motherboard Tray
I built my motherboard tray out of a scrap bit of metal cut out of an old CD player. I used this, because the height of the folded up part on the left happened to be almost the exact height of the video card I used. The motherboard needs to be raised from the surface, so I mounted standoffs in the proper positions. I also cut a hole for the back panel out of the side of the metal. To secure the video card, I drilled a hole in the top lip of the metal. The video card is bolted to this through the hole in the low profile back panel adapter.
Step 3: DVD Drive Mount
To save space, I decided to mount the DVD drive directly to the bottom of the motherboard tray. To do this, I just cut the aluminum drive bracket out of an old laptop, and screwed it to the bottom of the motherboard tray. I glued sheets of felt to the top and bottom of the slot in order to eliminate vibrations.