Ah, yes. I have been told several times to be careful with this, as i am not Australian-Aborigional, but, since i last posted i have changed my overall idea for the opera. It is still going to be set to the same basic storyline, but not in its origional aboriginal 'dreamtime' form. I will just use the main concept/moral of the story and go from there.
And thankyou, for your advice on notating the didgeridoo, its a good idea and i will give it a go. I would still appreciate, though, some other ideas, to see if i find one i really like.