These arrived here today from Hong Kong.
The CF-to-CEATA adapter seems to work -- I've got a Sandisk Extreme-III 4GB CF card in the notebook right now, installing Kubuntu-kde4 onto it.
There seem to be 6 unused pins on the CEATA connectors -- the original Toshiba HD had those "left over" when connected, and the CF-to-CEATA adapter also has those "spare" pins. Gotta look them up someday to see what they were put there for.
Also, the pin-1 labelling inside the notebook, and the pin-1 labelling on the CF-to-CEATA adapter disagree. I had to flip the adapter over to the other side to get it to work. I've added a label to it to help me remember next time around.
Still hunting for a 160GB CEATA drive (or even a 120GB), but so far the "unopenable" 6th generation iPod Classic seems to be the only source.
Pity one has to literally crack the case to open those up; apparently earlier generation iPods could be opened without damage, but not the newest ones.
Cheers