Update: success -- see reply below
Thought I'd share my results so far -- I am close but not quite there.
CPU: i5 4670K
Mobo: Gigabyte GA-Z87X-OC
HDD: multiple, but used new Seagate 3TB 7200
Ram: G.Skill Ripjaws Z F3-2400C10Q-16GZH 16GB (4x4GB) DDR3
I used latest MyHack beta (3.2 beta 8) and the current Mavericks installer onto a 16gb USB flash drive. Said no to MBR patch.
Boot into the mobo's boot select menu by pressing F12 on startup
The installer will hang at the gray apple logo using default settings, but using graphicsenabler=no -v -f gets into the installer perfectly. (Run using 7970 mini DP port)
Format the target HDD (it was already GUID formatted), with a single HFS Extended Journaled partition, using Disk Utility
Installer proceeds perfectly -- answer yes to remove all recommended unnecessary kexts
Overall, takes about 15 mins, faster than the Mac Pro I have under my desk
At the restart dialog at the end, pressing restart causes an unhandled exception. Manual reboot works fine.
BOOTING & TROUBLESHOOTING
The installed partition is detected but will not boot successfully, either when selected from from the usb stick or from the partition itself. Regardless of bootloader options, it starts to boot for a couple of seconds but then hard reboots.
A -v boot (captured by videoing the screen, since it doesn't pause) shows it is
Loading Darwin 10.9
Loading kernel mach_kernel
No kexts appear to load - just messages about no DSDT found, No SMBIOS replacement found, but Found SMBIOS System Information Table 1
It restarts immediately after
efi_inject_get_devprop_string NULL trying stringdata
with just one
starting to show
I can re-run the installer with just graphicsenabler=no, and all utilities work other than system information. Booting with mini-DP hooked into the 7970.
I am a developer and will play around with it, but would be interested in any thoughts in the meantime. Given that the installer runs fine, I am expecting it is a config option, but can't think what.