I was going to do this a while back and even opened a thread on it, because i thought i had a "deal" on ebay for 5 drives. Turned out the seller was a deadbeat and at least he finally refunded me. So after that happened, I abandoned the project.

I was going to use a DC-DC circuit stuffed inside the powerbook somewhere. I was actually going to physically remove the backplane connector and adapt over the PB SCSI cable. Also somehow fit a terminator in there, as one is required in this sense.