Hi mate, good to see another Aussie in here. Would like to see your build progress. I don't think you will find the Owens corning material over here. I will be in the same boat as you when I get to the treatment stage. A Sydney company called acoustica was recommended to me. I think they are at acoustica.com.au. They sell high density batts which should be close. Don't bother with trying to source Linacoustic. I spoke with the Aussie JM distributor and they can't bring it into Australia without all of the certifications blah blah blah. Please keep us informed with what you come up with. Greg.