I use melemite for floors and tops and pine all round. If you use any sort of board do you measurements and get it cut at the place of purchase. I just brought some board from a big green shed and they have a machine that will cut the board dead straight.
Oh and the hoop pine plantations in QLD mentioned are just north of Brisvagas and contain Charlie Moreland park. See Lacie Heaven for more details.
And on my drive to Melbourne last week, I noticed heaps of gum plantations, Mainly E. globulum globulum also known as Tasmainian Oak. So it looks like native plantations are finally happening.