Success !!
(This was my second attempt, first time I couldn't get through "The Recovery Server Could not be Contacted" which appeared right after High Sierra initial installation screen ... and yeah, I also managed first time to destroy my main Maverics SSD boot drive, as I restarted the machine too often
)
My config:
Asus P6T Deluxe v2
Nvidia GTX 760
12 GB RAM
The path:
- finding the correct USB port from which would HS properly boot (not all work
- finding the correct USB port for keyboard to connect
- using cpus=1 and MacPro5,1 key-strings in clover boot, in verbose mode
- getting through "The Recovery Server Could not be Contacted" which appeared right after High Sierra initial installation screen (UNIBEAST 8.2.0 didn't work, but 8.1.0 did !)
- was getting worried when installation process went over twice ! But it was obviously doing Recovery Boot, which appear later on the clover boot screan
- after succesfull installation changing ionetworkingfamily.kext (read main post)
- running post installation procedures with Multibeast (just Easy Legacy installation)
What works so far:
- basically everything, except sound (I have Tascam Dm4800 mixer connected via firewire); will look into it closely today
THANKS to Augie and Swiftoholic for the excellent post and all the help !!