Hope he at least keeps the usb-c. When Oculus Quest 2 comes out I'd hook it up directly to the front of the PC. Perfect VR machine. :-)
Please refer to Page 1, Post 1.
As far I know this was just in the render and it's not decided if it's gonna happen, so at the moment there is no I/O on the case itself (apart form the board I/O on the back obviously).
Also there are not many itx boards that have got an usb-c header anyway.
Everything else, like measurements and recommended parts you can find in the first post or search this thread.