I am also looking for an external SCSI case with double Centronics 50 connectors to install a 4.5 GB SCSI 1 drive.
Got a master plan:
1 - Get drive and case working, hopefully with the SCSI switch working too.
2 - Partition with Hard Disk Tool Kit and password each partition with a different separate OS on each.
3 - Add OS and Application installers to a Data partition and finally have a SCSI digital toolkit ... again ... like I had in 1998!
MacBook Pro 13" 2GHz Core i7 (Business workhorse)
iMac 24" 2.66GHz Core 2 Duo (Home workhorse)
Indigo Clamshell 366 MHz G3 iBook (Classic workhorse)
IBook 500 MHz G3 (Homework workhorse)
Powerbook 520c (Project workhorse)