What works? Everything. Sleep/Wake, NVMe, Airport, Spotlight, AMD-graphics
ASUS Prime B250M-C µATX-board
Intel Core i5 7500 (Kaby Lake)
Gigabyte Radeon RX560 4GB
Airport-compatible PCIe-Card for Wifi and Bluetooth (BCM943602CS)
2 NVMe drives: Samsung P961 with 1 TB and 256 GB
Installed mac OS: 10.13.2
Added new config.plist and ssdt for AMD injection (config_amd_ssdt_10133.zip). With this config and Intel IGPU activated you'll get Metal2 (macOS GPUFamily1 v3). What did I do? Had to fake Skylake graphics or to prevent apps like iMovie or FinalCut from crashing. With Kabylake kexts loaded and IGPU as secondary graphics card, the computer will hard reset whenever the Intel GPU is utilised. Only Skylake kexts and activated IGPU will give you working Metal2 for the RX560.
Since this update a new approach is advisable to get the RX560 up and running (works for 10.13.1 and GM as well). I've added a working SSDT and injector kext that gives you graphics and HDMI audio. Sleep works fine too if you add the DSDT I compiled.
Credits go to @Toledo @Mork vom Ork and @Mieze because their work made this possible.
*Update* I've added NEW config.plist and DSDT. For proper graphics power management you have to activate onboard graphics in BIOS but make PCIE the primary display. Furthermore you have to inject ig-platform-id 0x59120003 and let Clover patch GFX0 to IGPU. This is the only way to avoid crashes of iMovie, FinalCut or slowdowns after video playback.
This may be the smoothest Hackintosh of my life. It is easier than Sierra install due to native support for most of the used hardware in High Sierra. Not much to do, using an up-to-date Clover version like 4184. Make sure you have apfs.efi in /Clover/drivers64UEFI/ on your EFI partition and that you delete EmuVariableUEFi.efi (downside: iMessage doesn't work without it). Somehow Rehabman's SSDT in /Clover/ACPI/patched helps avoiding crashes in iTunes.
Needed kexts (on your EFI into /Clover/kexts/Other): FakeSMC, IntelMausiEthernet for ethernet, USBInjectAll and XHCI-200-series-injector for USB, Lilu and AppleALC for audio,
Whatevergreen for AMD graphics, IntelGraphicsFixup and AMD9xxxControllerPatcher.kext.
DSDT and SSDT go into EFI/Clover/ACPI/patched.