Got an original Quantum Snap 1000 unit with no drive, and thanks to many people on this forum, and going back and re-reading many times what has been previously written, and a generous sharing of the 1000 image and OS4.0 --- I now have a 30 GB primary drive in the main unit, a 160 ATA133 Western Digital drive in an external unit (reporting a 151 GB of available space on it), and a unit that thnks it is a Snap 2000 running OS4.0 and working fine. Just for spite, I even added a duplicate of the boot partition on the second drive, so if one crashes, I can use either drive to reboot with. Thanks Guys and Gals!!!! Won't bore you with rehashing the details, suffice it to say, upon careful re-reading and some expermentation, it does work. Wish the power supply was a bit better, but I'm happy with an external box to supply the power and a place to put the drive. Lesson learned, never throw anything away, no matter how old, as it always comes back as reusable. External case was an original external drive bay for a Radio Shack TRS80 (who still remembers those), but it was connected by a ribbon cable that is just right for this application.
Thanks again, and keep the faith.