I scanned and cleaned up this outline for a Custom 360 Template so that artists could use it to make some specially formatted art for people's 360s. So that you could draw around the holes where the disk drawer, memory card slots, and USB holes with some custom art, rather then just slapping some random picture on it and have it get all cut up when placing it on your 360.
The picture should be full 1 to 1 scale when viewed in full. This template I'm keeping in my scraps, but any art that gets drawn onto it I might upload to my meager gallery if I get sent anything. (And with permission)

Also, I suggest using the template as a rear background layer, and then drawing over it, then removing it when done. The lines are only for guidance, and where to cause creases/cuts when placing it on the 360.