Update: tried GraphicsEnabler=Yes or No - same end as above.
With PCIRootUID=1 I get the install stopping with the screen shown below (or, with a 2nd try, again the KP from above).
For me it looks like a problem with my graphic card, but it worked with iboot/10.6.8 (though it was not recognized and shown as unknown, but it worked with complete graphics).
Andreas