Pretty much agree, esp the bit about the re-installation and about W.A.. However the confusion stems from VSB 6 which is a Federal document is in itself a tad vague and open to various interpretations. If it was a defining document then all the States would have to comply and Vic for example couldn't say it's OK for less than 10 seats and NSW say no it's not.
Qld, Vic etc all have State Regs and Interpretations derived from VSB 6 published on their RTA (or equivalent) websites whilst WA and Tas either have none and rely on VSB 6 or have hidden the details away and hard to find. To make matters worse some States have an agreement to recognise interstate plated vehicles (tourists or whatever) that don't comply with the local reg and others don't.
Beauracratic Minefield at its best....