Just a comment on the Vans, I worked as a mechanic in the 1960's in a BMC garage. We used to detail the new cars when they were shipped down to country NSW from Sydney as they had protective wax on them which was removed with white spirit, anyway I remember a particular, brand new Mini Van arriving with a fold down rear seat that when folded down the floor was still the same as a normal van except for the cut to allow it to fold up. I believe people wanting this could arrange for it through the dealer who then had the factory outsource the conversion before shipping. I believe it was a Leyland Mini van.
Cheers, Frank

Old topic I see but I've been absent for some time.
I run a private register/source of information on travellers/countryman and estates for Australia. I am aware of 48 of them including my own. I started the spread sheet back in 2008 and add to it when I find new ones. The list consists of a car that only the floor remains to complete cars both restored and unrestored.