Summit racing. I ordered the AMD panels from summit, but they shipped straight from AMD because summit was out of order.
I ordered my tail light panel and my full quarter at the same time and I guess summit had a shipping error and I wasn't charged freight for the quarter. Quarter - 300$, tail-100$, order total came out to 404$.
Then I ordered a new hood that was AMD from summit as well and it was the hood cost + 100$ freight shipping charge.
The reason I chose summit is because they came out to be the cheapest with shipping. I looked around a lot of places and summit is usually the cheapest.
You will just have to look around. Also maybe there's a classics shop some where on Australia that sells panels. I just checked summit shipping charge to Australia.
If you wanted to go completely all out and order brand new panels that are rotted out(which I wouldn't recommend and I'll tell you why.) all at once... this is what you get from Summit. [Driver fender, Driver and Pass Door shells, Pass Quarter, Tail panel, and 2 replacement floor pans.]
That came out to 1700$ in parts and then 3600$ in shipping charge.
The reason I wouldn't advise at ordering all new parts is because the originals (If salvageable) are best. For instance your Pass quarter at the back of your wheel well corner You possibly make a pretty decent patch panel. Or instead of paying 300$ for a quarter. You could pay about 50$ just for that corner-ish area.
Over all what I'm trying to say is there is plenty that is salvageable and you wont need to buy a lot of those parts if any.