Glad you made reference to keeping OS 9 stuff.
Before i XPOSTfactoid my 8500 i installed a second internal hard drive and installed OS 9. For me it was a scarry blaze of text when i ran XPOSTfacto: made a lot of errors and had to redo th e process a number of times before i was able to get the TIGER running. Had to use TIGER because i was able to scoff the first two CD's of 3 CD's in exchange for the Tiger DVD.
Hope the KANGA OS X installation goes smooth. Let us know please.