I don't know much about the HKS but I think if you could do it for under 50k AUD with a 912 it would be a very affordable package. Just dreaming.... but a tandem seating option would be good for the odd pax flight but more importantly usable space for kit for going places. I like the look of this plane but wonder how much you would really end up spending adding skins and paint and the rest? at 14k USD + skins, paint gauges, engine, transport and the GST you would not get any change from 65k AUD I reckon.
If you could offer something like the Super Skyraider for under 50k AUD RTF I think you would be in a good market. The gas strut shockies design of the Super STOL Highlander would be a great design inclusion.