Kaleidoscope runs fine on my Quadra 840av!
But then most things of that era do
badass computer, even after all these years!
Copland's appearance was a wierd mix of 8.1 and 8.5. it featured the little mini icons in titlebars, but didn't have the app title in the menubar the way 8.5 does. it used a different system font, the trash can was overhauled, and there were some slightly different UI elements added (Carbon evolved from the Copland API).
I don't think Copland could ever have shipped. Internal politics were against it. Management and marketing wrote checks that the engineers couldn't cash. It was messy, and it ended up sucking. What they pulled out of it was great though!