Hi Ben and welcome to the forum.
This could look very cool slammed down with some nice banded steels. Sadly, I can't offer advice, I don't know what the rear suspension setup is like on these, whether it follows that of the vans or is different. There may be someone on here who knows though.
What part of Australia are you from? I traveled out there a few years back and saw many, many beautiful places. I'm still not really sure why I came back to the UK!