Perfect kaby lake "Mac" mini / hackintosh! Running 10.12.6 beta perfectly -- only things not working: wake from sleep and the two fance usb ports (usb-c/red 3.1). One small patch for audio and nvme, otherwise all native.
Replaced the bt/wifi module that came with the board with an Apple part using the adapter. BT even works in the boot loader! The Apple -> NGFF adapter + the 653-0023 card combo is a tight fit, but it slots in nicely under the noctua (the intel cooler was too bulky).
I ended up scavenging the fractal design case for parts and building my own out of my old mac mini's box :-D. I moved the power/reset switch to the back of the mobo between the display and ethernet ports. Dropped hd led and the extra usb/front audio jacks.
More details on macOS install: https://gist.github.com/adriaanm/836c6a74f77e92950f5a83de5c711b54