Great job.
I'm just beating my head against the table trying to start the OS X installation from a USB drive.
I have PM G3 B&W, PM G4 QS, PM G4 MDD here -- OS 9 boots without problems, I used the following commands:
boot usb0/@1:,\\:tbxi
probe-usb boot usb0/@1:,\\:tbxi
I also tried to specify...