@BigBronc: yeah, you have Kickstart and Workbench 2. Nice middle ground back in the day, but pretty much useless today - IMO. Since you're wanting to play around with your Miggy, I'd suggest procuring a Kickstart 3.1 ROM (16-bit) and a Workbench 3.1 disk set. It'll make your life that much easier, plus the interface is excellent and compatibility is high. I highly doubt you would need a 3rd party program to get that CD working with OS3.1. Your SCSI controller is indeed gvpscsi.device then. After you get the 3.1 disks, make a backup of each (if you only back one up, make a duplicate of the 'Install' disk), insert Install, highlight HDToolBox and in its Tooltypes, change the device from scsi.device to gvpscsi.device and then save. Now you'll be able to format a HD and add your SCSI CD drive AFTER you've done the same with the CD0 icon.
If you're content with running 2.x on your system and you want to add that CD drive, you *will* need a program such as AsimCDFS installed.