That's not quite right - Revs A - D were all tray loading. I had a lime Rev D, which was a tray-loading 333Mhz G3. Slot-loading began with Rev E, and then there were the DV, DV+, DV/SE versions before the iMac G4 (lamp) was introduced.
Looking at images of the last G3 iMacs, the design was actually really pretty good. Plus the colours sage, graphite and snow were absolutely beautiful. I hope they introduce some colour variation with the upcoming revised iMac.
You are correct - I was more classifying revisions by major changes but your table is more accuarate as far as model variation/differentiation.