Im not sure on the hold file, you are probably aware of the recent aircraft upgrade in size so I have seen some feirce recruitment recently. The ground schools are small though.
The flying pay is around the $4.25 per hour from sign on to sign off at home base (ie if you sign on monday in CNS and dont sign off again until wednesday in CNS you would get paid $4.25 for each hour you are signed on away from CNS, which covers all incidentals and there is the grooming allowance and a telephone allownace payable each fortnight. (dont quote me on these figures).
I would think 5 - 10 overnights per roster, and allowances could potentially add up to 8-10k per year, tax free of course.
You can search for the current Sunstatte EBA on wagenet.