Sara
As far as I can see your:-
BNE-DRW
DRW-SYD
SYD-MEL
MEL-SYD
flights are within the rules:-
<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Within Australia - only one nonstop/single plane service flight is permitted between the following points:
Brisbane/Cairns/Sydney - Perth
Melbourne/Sydney - Darwin</font>
The SYD-HNL flights do not start until 28th October. Does this fit with your schedule? These flights are operated by 747-300 with the old Business Class seats.
As I said in your other post you could maximise your mileage by adding LHR-IST-LHR to your European segment.