I installed Sierra successfully by doing a fresh install on a unused SSD, and I have updated the Post #1 installation and benchmarks to reflect the Sierra 10.12.1 installation.
Basically, I did the following:
Create the UniBeast (Legacy) USB installation thumb drive and put MultiBeast for Sierra on it. I used a USB 2.0 thumb drive and inserted into the USB 2 plug in the stack with the PS/2 plug.
Booted into the BIOS and set the thumb drive to be the boot drive. Saved the BIOS change and rebooted into the installer.
After the installer complete, the system rebooted and selected the Sierra installation (still using the thumb drive as the boot drive).
During the second part installation of the installation, it will ask you to log into your iCloud - don't - do it later.
Next, the installer asked if you want to use Migration Assistant to recover you previous installation applications, user information, etc. I chose to bring over my El Capitan installation applications, etc.,
but don't check the Other Files box.
Copied MultiBeast from the thumb drive to the Desktop and ran MultiBeast with the following configuration choices:
Quick Start > Legacy Boot Mode
Drivers > Audio > Realtek ALCxxx > ALC889
Drivers > Disk > 3rd Party SATA
Drivers > Misc > FakeSMC Plugins
Drivers > Misc > Fake SMC HWMonitor Application
Drivers > Network > Realtek > RealtekTRL8111 (latest version)
Customize SSDT > Options > Sandy Bridge Core i7 <---You will need this for an i7 K processor (there is also an option for the i5 K processor).
After MultiBeast completed, reboot into the BIOS and change the boot drive to the Sierra installation.
Done! Everything should work OK.