I'm guessing you have weighed up the build versus buy pros and cons, but if your build considerations include your lack of building skills, don't be concerned about that aspect. I am building a 75% Fokker Dr1 and the build process is extremely straightforward.
Unfortunately, I don't know of any for sale in Oz at the moment. As well as Andrew at TAVAS who is probably aware of many of the builds going on, perhaps the RecreationalFlying.com website may be useful if you haven't already tried that avenue.