Not sure about that one, sorry. When you're talking about SOE, you're talking about the "old" (ie. 2011) CAR 30 system which has been replaced by the CASR Part 66 system. Part 66 relies more on OJT books that are aligned with MEA competencies, where you sign off particular tasks, as opposed to the SOE system of compiling your own list of jobs carried out according to ATA chapters.
So the trick for you will be getting enough SOE put together to pick up a (presumably) type rated license before CASA stops accepting SOEs for assessing, which will happen in 2015 (I think).
If you then decide "Bugger it, I'll go the OJT system", you'll need to prove 4 years experience for B1.1 (aeroplanes turbine) and B1.3 (helicopters turbine) or B2 (avionics) and 3 years experience for B1.2 (aeroplanes piston) and B1.4 (helicopters piston). And that's from when you start the book! So, either way, you've got at least 3-4 years of collecting signatures before you can expect to apply for a license, because the dates in the SOE/OJT are the only way CASA measures your experience by (I think).
Cheers,
John