Thanks for that. I fitted single seats on swivels to my T5 when I converted it. It was a very simple job. Just replace the seat bases, fit the swivel and then the seats.
I havent seen the Caddy, but imagine its very similar to my Golf where the seat is attached to the floor and also there is the centre console to negotiate when turning the seat.
I have seen a couple of options. The best being the Zooom one, where the seat is tilted sideways, and then rotated, but looking for actual experience. I will join the VW Caddy forum and ask there as well.
Its actually for my 83yo mother, so ease of operation is important as she has arthritis in both hands.
Boardinbob, agreed the seat will be a bit low, but will add valuable space to an existing cramped vehicle. My mother didnt want anything bigger as its also her daily driver, so needs to be easy to use.