I wrote to a few camper conversion places and also an Vehicle Inspector reply and if I want to NOT keep the seats, and NOT put them back in to pass next years registration then I do need a new certification from a People Mover to a Transit Van type.
It wasn't too hard to accomplish and I had to do it in a hurry.
So I removed the seats, some nice guy where I have my storage lent me his Rattle Gun and also gave me a hand (Those seats are heavy!)
I removed the carpets and underfloor padding, silicone sealed the bold holes so I didn't asphyxiate from the monoxide, also covered them with heavy duty tape, and anything else that added to the weight. Then used a weigh bridge and had the vehicle weight, got a RTA ticket $25 and presented to the inspector who took photos, did various check, paid him $450.00 and I will receive paperwork which I just need to present to RTA/RMA and then it's a van which is great as being classified as a people moved I was unable to have REALLY dark tint on the passenger windows, but now I can. I just need to leave the front driver and passenger, front windscreen and back windscreen with the legal lesser tint, but will be good to have the sides black as I will be sleeping and using computers in the van.
I have been taking photos along the way and I will create a bog showing what needs to be done, so if anyone else wants to do what I have done, then it'll hopefully make it a bit easier.