I think I know who you are.
I would strongly suggest you apply and get your own C45 my friend, even though you are subcontracting out work to licensed installers you are breaking the law and posing as a contractor that can cause you to serve jail time and pay fines. CSA is cracking down in conjunction with the CSLB.
Only licensed contractors can "subcontract".
The better way for you to do this sort of work if your not licensed is take a finders fee, or become a licensed salesmen for a qualified company. You can cause a lot of headache for yourself and the qualified individual should something go wrong on a job and they find out the executing company (you) are unlicensed, even though you subbed it out.