Well, you'll need a SCSI HBA to use the SCSI drives, and the A600 doesn't have one. You could use the Squirrel SCSI (a PCMCIA card), but it would probably cost you less to get a buffered IDE interface and a new ATAPI CD-ROM and run the cable through a cutout in the case. You'll need a beefier and/or an external power supply in either case.
Trev