What Mark is saying is true, except in Canberra ipe is not easy to get (read you will have to import).
Tim, I am also from Canberra and have made a few warbows, laminating is the easy part, finding good quality wood is the challenge in Oz. I suggest you head down to M@#$%& Timbers in Fyshwick and have a look. (JD, hope this satisfies your advertising rules).
I spent three years building a pile of wood splinters, now I reap the benifits of my toil. I have taught a few blokes how to make bows in build-alongs so they did not have to go through the pain that I did, will be willing to show you and your mates a few of the tricks on how to make bows instead of fueling the BBQ!
Also, to prevent the bang on the head I ALWAYS wear a helmet when testing a stave. I learnt that lesson early on, thrice!
Hope you get your warbow, loosing an arrow from a warbow is one of the joys in life!
Gaz