Hi Zordah,
I am personally doing it this way and it has worked out a lot cheaper for me, doing nav's in a Jabiru 230 at 165$ per hour turns out a lot cheaper.
After you get all your nav, pax carry etc with RAAus (only 1 pax as all the planes are limited to two seats) you will have about 40 hours up, then you have to get a CASA SPL, ASIC card etc, then sit PPL exam and do about 10 hours in a cessna to get certified in CASA system and get experience in controlled airspace and I think a few hours "under the hood" going IFR then your done.
I have got the CASA licence now and done the PPL exam, just have to do the flying part.
Dont worry about what the GA people say, RA Aus and their planes are great, many with composites and glass and faster than cessna ... and cheaper too!
Thats my opinion anyway. Others may agree or disagree?