I've been searching for some time for proper info on what the process is for removing the rear seats & belts legally in a hatchback such as a 205. Frankly noone can fit in there anyway.
So I emailed the RTA's technical enquiries office and promptly received a response. I've decided to honour the RTA's email disclaimer and not copy and paste directly here, however bottom line for the process is:
* Remove seats
* Drive immediately to blue slip inspection station with registration paperwork (incl. certificate of registration) <technically the most legal way would be to have the inspection station remove the seats...>
* Have 'adjustment of records' inspection done (I'm assuming it isnt a full blue slip inspection or I'd fail miserably...)
* Present 'adjustment of records' to RTA motor registry to have a new registration certificate printed.
Hope this helps answer some questions, and I'll put in some search tags below
removal of seats
NSW RTA seats
back seat remove