Love to see MacOS on new stuff. Have you looked at Basilisk?
xenophonf
Basilisk only emulates 68K Macs, not PowerMacs, and Mac OS 9 only ran on the PowerMacs like the G3 and G4. Mac OS 8.1 was the last version to run on 68K Macs like the Quadra, and it's the last version you can run under Basilisk as a result.