Made my own ROM for the 17" 1.33 GHz PowerBook G4 the other day.Adding ATI driver by
darthnVader made resolution switching possible.
I also made the backlight adjustment to work.
Audio works without quirks.
ASIO driver for my FireWire MH 2882 interface works.
FW800 port works at FW400 speeds, but has the same problems as any other FW800 equipped PB G4 with many external drives (but not all) producing errors.
Networking not tested (not interested).
What doesn't work is graphics acceleration, but, honestly, I can live with that until
darthnVader nails it (nag, nag).
Given that 17" 1 GHz model often has problems with L3 cache and disables it, this one has a chance to become my favourite large display G4 portable machine, because it has larger L2 cache and is faster.