I wasted a good portion of the last 3 or 4 years, lots of time and money on this idea. I've created then thrown away at least 6 full prototype xbox case prints that I was not happy with, redesigned several times etc.
Here is a link to all versions from start to finish. It's not perfected still, but I am happy enough with mine that I'm not willing to pursue this anymore. I've shared them on cults3d and thingiverse but it's hard to put all the data there.
To be clear, anyone can do anything they want with any files I've shared.. print and sell, edit, etc etc. Includes x3cp stl, xtender stl, stock face stl, power button stl, and prototype stl or obj files.
I even tried to make a theme based on prototype. It should all be found here.
https://drive.google.com/drive/folders/1jPioe3_N8f_HiEhmXxccLfFvJ9h86N6K