Virtually any 50-pin SCSI drive ought to work. I wouldn't bother with so many small partitions. Make 'em about 1.75 GB. (IIRC old Mac OS had a 2 GB limit or something so you want to avoid that.) When a Mac boots and searches for a drive is starts with ID 0, then works backwards from 6 (7 is the ID of the computer itself). The internal CD-ROM is typically found at ID 3 on Macs.