Last year I tried to get a Validation for a 2 month visit to Australia. I went through all the requirements OK. in the end I was stumped by a CASA lady informing me that i would have to attend an interview on arrival Australia in Sydney, for a Security Pass. This could then take up to six weeks for issue!! I wasn't planning to visit Sydney, staying in Perth, a 4/5 hour flight away, and at this point I gave up.
So impossible requirements for short stays.