Might want to check how well you go now....
Haven't bought a property since early 2010. But did get a pre-approval later in 2010 for upgrading PPOR which we decided to delay and instead I used the funds to invest in share portfolio.
Have a 7 figure margin loan approved few months back which I have used up more than 60%.
Whenever I have needed to borrow money to invest I have never encountered any problems whatsoever for being a contractor.
Cheers,
Oracle.