Same here amigadave. My CSPPC has a Plextor UW SCSI CD-ROM attached to it but nothing else..I use a 16GB IDE CF card as my hard drive so have had no need to attempt to connect a SCSI HDD.
That being said, and this is entirely from memory, I did once have an 80pin SCSI drive attached to it once to trial an install of OS 4.0 and it worked fine. From what I can remember I had the Cyberstorm on one of the middle connectors (not an end connector) and terminated both ends of the cable with an active terminator. I think I had problems using the CSPPC as the terminator so I plonked her in the middle.