Flick me a message if you need some contacts. Mckays would be your best bet for boards, tas timber wholesale sometimes or brock building supplies believe or not. If you get real stuck I can run the mould. I don’t have 4 sider but got a spindle Moulder with most cutters. If you could be bothered removing them and denailing I can also skim them through thicknesser and remould. This will only work if they aren’t to cupped.
If you do need people hit me up and I can point you to some good tradies. Been in the game a while now and Tassie is a small place. Unfortunately heaps of cowboys out there now and only going to get worse now.