Hi MakUK,
Everything is quite described in my post and in links to guides that I used, as I didn't want to copy someone else's work. If you have the same configuration as I do then the installation is very straight forward:
1. Prepare your UEFI/BIOS accordingly (see screenshots in my post).
2. Install the operating system from either Snow Leopard 10.6 installation DVD or from a prepared and bootable UniBeast thumb-drive with El-Capitan or Sierra installation files (to create a UniBeast installation media you'd need to have access to a working Mac/Hackintosh first).
*Please note that when I built this build, El-Capitan was the latest OS from Apple but I didn't had a working Mac/Hackintosh to prepare a bootable media of El-Capitan with UniBeast. However, I had Snow Leopard installation DVD so I used the guide to installing it just to be able to access the Appstore to download El-Capitan, and eventually to prepare the bootable thumb-drive with UniBeast. At this point I'd go straight with macOS Sierra.
3. Upon the first boot into the system you'd need to install some kexts in order that the OS will be able to boot by itself from your hard drive, and for additional hardware to work such as network, sound, etc. For that download and use MultiBeast. For this particular system use the version that I suggested to use in my post as the new version at the time didn't work for me.
4. Once your OS boots by itself, check if things like network, sound, etc are working correctly. If so then you're all set.
If not, re-launch MultiBeast and make some adjustments; if the system doesn't boot correctly after applying some kexts you could always boot from the thumb-drive and then to select your macOS partition on the hard drive to boot from. Booting that way will ignore any additional kexts that you installed and you should be able to reach the desktop. Once there you could re-launch MultiBeast to make adjustments. It's a trial and error process, but I believe that if you'd select exactly the kexts that I selected in MultiBeast (see the MultiBeast screenshot in my post) then you should succeed at your first run.
Cheers