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I'm planning on modding a case similar to this one:

http://www.amazon.com/Xbox-Pro-Gamers-Aluminum-Case/dp/B00006DY1I

I want to make a stylish portable desktop case that i can easily carry...

how about a cigarette lighter from a car?

You can try hiding cables behind your mobo or the mobo tray if possible. Even on the other side of your drive bays might work.