I've been in contact with gaz and he's not looking to make money from this, in fact if I read between the lines correctly (which I'm not always good at :doh:) I suspect the time and effort involved in all the cutting/welding/modifying will keep him from doing other things he wants to do.
I've been researching this some more and Holden do have a listing for a deeper pan from a Cadillac STS-V.
http://i122.photobucket.com/albums/o...c/Caddypan.jpg
I've emailed a contact at HSPO (Holden parts warehouse) to see if he can get someone to compare against the stock pan to ensure they should just bolt up. I don't want to buy one because it's a special order (non return) item and I can't afford to just waste $100 on it if for some reason it won't fit.
Assuming it does fit it should be a much easier/cheaper solution for 99% of we A6 owners. Holden don't have a listing for the corresponding filter but I'm sure something along the lines of what gaz did with his filter could be done.