Thanks to all for all their comments. It has brought me a step closer to an actual install... but not yet!
I have a GA-EX58 (socket 1366), 6GB MoBo with SSD as a boot and 320GB data HDD.
I used uniboot to load with the following flags:
GraphicsEnabler=Yes PCIRootUID=1 ncpi=0x2000 darkwake=0 -v -x
This has enabled me to get into the Mavericks Install application.
However, after clicking "continue" on the install screen, the program asks for the HDD to install, and no HDD's appear! Checking with the Disk Utility show no HDD's except for the USB.
Any ideas what to do?