Thanks for this.
To clarify a few points.
All international flights use T2. This includes some flights that have a domestic tag leg to an international destination/from an international origin. A number of airlines have these kind of flights.
Lounges, international - NZ is on the ground floor, UA, SQ, CX, MH, QF (business) are all on level 1, main departures & most gates are level 2, QF (first) and EK are level 3.
Lounges, domestic - QF also has business class lounge which is entered from within the Qantas club.
There is no international transfer desk so international to international transit passengers who have not yet received their boarding pass for the onward flight need to collect them from the lounge (QF & SQ and only if you have access to the lounge) or the gate.