Hello,
Your guide is EXCELLENT. Thank you. I have Sierra 10.12.4 running on an ASROCK X99 Extreme 4/3.1. Running like a charm -- all 10 CPU cores, with Nvidia 980 graphics card. Getting amazing Geekbench scores. Can't wait to run it with Avid Media Composer, DaVinci Resolve, etc.
One criticism of the guide is that it provides a config.plist file that sets the System Integrity Protection (SIP) to "disabled", which makes it completely impossible to install any apps from the App Store, as well as most other software that checks for SIP.
To fix this problem, you need to edit the config.plist in /EFI/EFI/CLOVER/config.plist. Modify this section so that it says:
<key>CsrActiveConfig</key>
<string>0x3</string>