Have you tried using a factory-pressed CD that's known to be good? Some older drives might not like writeable CD-ROMS. The SCSI ID shouldn't matter, as long as it doesn't conflict with other SCSI devices on the bus. It's also possible you have a defective CD-ROM drive. This hardware is 30 years old, which is pre-historic in computer years, I'm old enough to remember when it was cutting edge. Showing my age...My last SCSI computer was a NeXT STATION that I had running with an internal drive, one external HDD and an external CD-ROM. I restored it, and it worked great. I sold it to a collector about a decade ago, and now he has quite a NeXT collection. Now I just play with Powermac G5s... It's heroic of you trying to get that old Powerbook working. Keep up the good work!
As for me, my next restoration project will probably be an old Heathkit ham radio from the '60s. Way off topic here. But old electronics require lots of TLC, patience and luck. But it's rewarding when you get it working, and you always learn something along the way and that makes you a better person.