I think that this all needs a bit more thought.
Going back to 1965 when I converted a new T2 panel van with help from Holdsworth (they cut the holes and put in the roof and windows and left me with a kit of stuff to fit out the interior) the total cost with tax was about £1,100. This was sufficiently cheaper than a Danbury to be worth the effort. I didn’t consider a Westy because they were just too expensive, and hard to get.
However, the primitive T2 cannot be considered to be the equivalent of even the most basic T6 So it is amost impossible to make price comparisons.
Nevertheless, working on the assumption that a Westy would be a couple of hundred pounds more than the Microbus - say £1750, then using the inflation increase this would be just under £29,00 today. Taking into account the extra cost of a modern Fiesta compared with the inflation-corrected price of a Capri, then we get a 2019 price for a basic T6 Cali of about £46,600.
I wish.