See if you can get hold of Andrew (Treloar) User ID archangel007 on the forums. Though he's in Burpengary and I don't know where you are as you don't currently have your profile complete with location details. I don't know anyone else that is specifically in QLD who's done the swap. Alternatively, a very quick search through
https://www.tmr.qld.gov.au reveals
https://www.tmr.qld.gov.au/Safety/Vehicle-standards-and-modifications/Vehicle-modifications/Frequently-asked-questions-vehicle-standards-and-modifications#aplist which states you have to call them to get a list of approved engineer persons.
_________________
-Alan
I blame my dad for my love of minis. I think I was conceived in the back seat of one
I also blame my Dad for me being 6' 1" - not really the optimum height for driving a Mini.