Thanks for the replies... currently I am on Norfolk Island, but the trailer isn't for here, I will be in Rockhampton for work for a couple of years so will get a trailer and drag the kids around to see a bit of Oz, expecting to maybe do the rock and Fraser Island trips as well as weekends fishing on rivers etc.
I had a look at your customline Kingbilly and something like that looks the go, something strong and sturdy to start with and I will add bits and pieces as I go, I can turn my hand to most things as long as it doesn't have to be something to pretty. I don't really know what brands are Oz made or imported, just lots of reading I guess, One thing I really liked on Kingbillys was the bed layout rather than what I have seen on most so far... is that a custom tent to do that?