It certainly was luck!
I'd like to have your kind of luck! 
Anyway, got the G4 installed tonight and yessssssss it works!
I'm trying OS 9 first as this must be one of the ultimate OS 9 machines now, woah this thing is sooooo fast! You know what, I just think this G4 thing might just catch on, this is one serious processor! (PS anyone know when Mac OS 9.3 is coming out?)Now, is that a Leopard I hear growling in the distance?...
PS thanks for the advice guys, the reassurances and guidance really help as I get scared doing stuff like this! I'm really going to need you soon though (and will make a topic in due course) if we are going to win the Apple vs. Beige Macs war!
Steve and co have been trying to kill the last of the Beigeys for years, we can't give up now, especially after clearing the major hurdle of getting AltiVec in a Beigey! Anyway, I think it would be a terrible situation if you could run Leopard on a Beige Dell (which you already can) but not a Beige Apple