there are a few places that do that but i think they are more spare parts wreckers, not a shop like your suggesting. its always good to have a decent spare parts supplier that wont charge you stupidly for parts. so if u do go ahead, i dunno become a sponsor on SAU, give us good prices ( maybe even discounts for sau vic members:D:D) good turn around times, and of course good service and im sure you will get business. it all comes down to marketing i guess. market yourself right and u'll be sucessful.
good lucks with it. which area are you planing to open up?? not in geelong i hope cause thats too far for me...LOL