Comments:
=> Double majors
This depends on which degree you're doing. Normally Commerce/Science students get one major in each, and will finish in four years. Commerce/Arts students are in for five years, but have the bonus of getting two majors in each (if they so choose).
Commerce/Engineering is new, so I don't know what the current policy is - check with Engineering first, then Commerce (Engineering are more likely to be flexible, or such is my experience anyway, if you want to do a double major instead of a single).
Whilst Commerce/Science students CAN do an extra major (I think - I've received several contradictory pieces of advice from Commerce staff at various times), they have to stay an extra year in order to finish it.
=> HECS
You pay whatever the charges are for the subjects you're doing. The fact that you're doing a double degree or any other degree is irrelevant. As long as you get HECS you pay it for the subjects you are doing and only those subjects.
Combined degree students will usually be at uni for a year or two longer, but make up some time because compulsory subjects from one degree are counted as electives for the other (you can't go and ask 'can I get Accounting 1A counted as an Arts elective', for instance, because it's already been done in order to get the 6 years of the combined program down to 5).
=> Honours
The requirements are a 71.00 average in subjects for the discipline you want to do Honours in (and you have to have a major in it - you can't just do Marketing and Finance and then try to claim Accounting Honours based only on Acct 1A, 1B, for instance!
). In addition, you can't fail any subject that you're doing*.
That's just a bare minimum though - if you don't get that you automatically get rejected. Gettting a 71 average doesn't automatically mean you'll be allowed to do Honours. That depends on other factors, not least of which is whether you can find a supervisor.
If no member of staff is interested in supervising your thesis topic, then you can't do it. You've either got to find another topic or not do Honours. This is usually not a problem, but does occasionally crop up...
*I'm not sure where Pass Conceded fits in - check this with the School/Department you want to do Honours with.
