the $7000 figure was provided by the union.
the overtime figure is apparently based on double time where duty exceeds 12 hours, this would be on both lax sectors with syd, currently 15:35 to lax,16:00 back to syd. double time and a half after 14 hours, 7-8 trips to lax per 8 week roster for 10 and a half months, 6 weeks leave, i'll let u figure out the maths...good luck.
as far as 'b' scale goes the A380 flying is the way to go, less allowances, overtime etc on the 747,767,A330 as "b' scale get the remainder of whatever flying left over after 'a' scale have had their pick at it which means lots of perth returns on the 747-300. that flying really sucks. next most likely trips u would get is j'burg, max time zone change of any trip on our rosters, poor allowances, work your ring off.
'a' scale rostered up to 200 hours, 'b' scale rostered 220-240, there is an element of burn out here but that would depend on the individual.
have not heard yet if 'b' could transfer to shorthaul after 2 years, if so and on full s/h pay and conditions would be the way to go. doubt the company will allow this back door to stay open if it isn't already shut. hope this helps