Oh, about the auction places. I have heavily researched your idea of buying a wrecked car, but my purpose was to repair it. So now I know a bit about this auction stuff :s5
Fowles auctions have relatively cheap damaged cars and are located in Laverton on Gordon Luck Avenue. More information and an inventory on this weeks cars can be found here
Pickles I don't have a clue about, but are located in Tullamarine. A inventory can be found here
Hope that helps.