For everyone that has PM'd me, I have collated all your specific questions and have forwarded them all the the head recruiter for the regional I'm starting with next week.
He's got an appointment with their immigration/corporate lawyer and will have solid answers as to the E3 process they will follow with regard to how to apply, getting drug tests and background checks done etc as there are some differences in the way they will face with Aussies not having a US drivers license and SSN (even though you will be able to get one once you have the E3 visa inhand and you're in country).
So bear with me for a weeks or two and I'll post the exact step by step process on here that you should follow.
I know there's already few guys working for them on E3's but the process was not set in stone and every case was slightly different.