Here are the pics of my temporary I-Opener setup, including the attached 3.5" hard drive and 5.25" 3-disc changer.

dmesg

My general setup in all its glory. Getting power for the drives from the PC sitting there. Just a hack setup, I intend to bring that down to one supply from an old external drive case.
Woohoo! Booted up a minimum Slackware 7 install from the 80MB hard drive running as slave, CD as master. Logged in and pulled up a dir listing of the first disc (popped an old Raiden CD in there for shooter fans).
Just showing my 2.5" to 3.5" adapter plugged straight into the motherboard with a pin-swapped 40-pin cable plugged into that...
And same cable running over to the drives...
Another miscellaneous shot.
mmmm, mail