Here it goes:

The external of the case. It measures around 7" wide x 5.5" tall x 9.5" deep. The black slit is a slot load DVD drive. When the DVD pops out, it's bordered by the One Ring.

The internal of the case. The white box is the motherboard (approx. correct dimension). The pink box is this with a standard laptop slot load DVD writer (Again, approx. correct dimension). The two yellow boxes are the two 60mm fans nested inside the case, just below the One Ring. The purple box is the 2.5" SATA HDD (Approx. correct dimensions).

The front view of the computer, showing Sauron's Eye as the power button.

No one ever said it would be easy putting it together. I only fear that it would not qualify because LOTR is copyrighted.

Edit: Read the question about the copyright issue. Does anyone know J.R.R. Tolkein's Email address? /sarcasm