thornbird,
Trouble is, there seem to be some rather big disconnects between what the actual regulations say, and what whoever wrote the MOS thinks they say.
Indeed, one might say the MOS reflects what the regulations were meant to say, but maybe don't.
It is a pretty big job wading through the whole shooting match (1600+ pages), I takes m' hat of to those with the perseverance to at least give it a try.
At least one chap in the glasshouse in Canberra has a pragmatic approach --- if you come across something that doesn't work, we will give you an exemption.
Tootle pip!!