If you sell your car as a going concern in QLD it will still obviously be inspected, but as its already QLD approved it will just be a roadworthy for transfer, so no probs there and by far the easiest solution.
However, I take it you have the relevant paperwork to go with each signed off item / mod / conversion, this is proof that a certified engineer had inspected and passed the mods on the same model car, youll find the RTA in each state will have a list of selected engineers you can have a chat with....most regs are the same Aus wide with a few minor variations here and there, its a case of doing some homework........or you could just tell them its a 5Lt