Think you need to have a copy of the "Go(o)d Book" in your hand when you apply. Not sure that they're looking for someone who just wants to build hours though it looks like great experience. However I suspect those who do it would occasionally question, "What am I doing here/How soon can I get out?". Hence, the advantage of a good chunk of faith to get you through the rough patches.
Good luck with it as they appear to do some good work (in Africa - can't say about ops in northern Oz).
Cheers,
Chips