Talk to Vicroads, 13 11 71 I think, they can send you a list of relevant ADRs. They are a bit enigmatic and often open to interperetation, but they are a start.
More importantly they can also send you a list of all registered automotive engineers in Vic. Then you can go out to some of them and discuss your project. I'd recommend NOT just calling them, imagine how many wankers they have ringing up asking about their fooly sik conversions. A personal appearance may get a better response.