Once I looked more carefully at the Apple Printer Utility it was no problem setting the printer IP address. Then it was simply a matter of setting the parameters in the Tiger printer setup utility and it works great from Tiger over the Ethernet LAN.
The HD is a Quantum Go disk, some of which are IDE but the manual says it's an SCSI interface for both the internal and external disks. The internal connector is a 40 pin ribbon connector about 1 3/4 inches long. Never having any contact with Powerbooks, I don't know if that's the same cable.