Here are the motherboard and PSU, and pictures of them mounted to the lexan tray.
And here are some images of the PC assemled and placed into the cubby.
Lastly, I wanted to test all of this inside. I read the mp3car forums and figured out how to make a test-kit from a normal PC PSU. I wanted something a little more permanent, but I didn't want to destroy the ATX cable on a PSU, so I bought an ATX 24-to-20-pin converter and hacked the wires on that.
I figured I could probably use the yellow and black wires from the ATX converter as the power for my test kit, but since every example on this site uses one of the molex connectors to power the PC, I decided to do the same.
For the interface, I wanted to write my own. I am a professional programmer, so I didn't expect this to be much of a problem. The tricky part seems to be the interface, moreso than the functionality. I made mine customizable, but I'm not a graphic artist, so I made my own cheap-o graphics. The thing will play music, video, CDs, DVDs, do GPS, handle screen dimming, and a few other things. I'm sure I'll change a lot of things once I start using it regularly.
Here's, the main window.
This is the media-browser window.
Here's the GPS window if you have MS Streets and Trips installed.
And here's the GPS window if you don't have MS Streets and Trips installed.
Here's a sample image from the CAM window.
Here's the EXIT window.
Eventually, I did test everything with my test-kit, and it all works. I even let it playback a movie for an hour, just to see if it would overheat or otherwise fail. It did not. At first, the Opus would not power up, because it was jumpered for 12.5 volts, and I was only providing 12 volts. Fair enough, I moved the jumper. Then it wouldn't fire up because the polarity of the power-switch-wire was reversed. So I flipped it around, and jackpot. All of these issues were easily diagnosed with the status LED on the Opus, and quick look in the manual.
So, here's what's left to be done:
Get windows tinted (this weekend).
Maybe get an alarm installed.
Run power wire through firewall, connect Power, Ground, IGN.
Find out if everything still works.
Run USB cable for rear-view camera.
Work on OBD.
Look into SSDs, EWF, etc.
Any feedback is appreciated. I am WAY too anxious to finally get this done now.