Update:
it work!
Not tested sound and network yet. but I am sure that will be ok when I find the right kexts for these.
Created USB with Unibeast for El Capitan
For install used GeForce 8400GS PCI-E x1 Edition (no injection)
Disabled Ethernet in BIOS (Integrated Broadcom® 5754 Gigabit Ethernet controller, as it does not work easily - trying to figure it out - see below for solution )
Used attached config.plist
Unchecked all DSDT fix options, added AHCIPortinjector to 10.11 kext folder on install stick, booted with -v only,
did NOT use -x (Safe mode) as it would always KP in the end
Installer boots just fine, installs fine on SATA 0 drive (NOT need for external USB)
Rebooted & got to finalize the install. Installed latest Clover (which on the day was Clover_v2.3k_r3944.zip) in ESP, boot0af in MBR
Installed Intel PRO/1000 CT Desktop Adaptor PCI Express & used
this injector kext
Or one can use onboard network following
this
Installed that driver to
/System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns/
fixed permissions, rebuild prelikedkernel
NO IP from DHCP, but manual IP works fine, so happy after all
Sadly onboard network does NOT come back from sleep
At this point swapped 8400GS for NVIDIA GeForce 210 & injected it in Clover config
Works (almost) perfectly fine, for sound used VoodooHDA 2.8.4 as described
here
Comes up from sleep really fast, but display initially stays black (it takes ~ 4 min for graphics to kick in)