I’ve been toying with the idea of doing somthing similar, but using something along these lines as a base as all of the core bits are there already…
ebay.co.uk/itm/Volvo-B12-Van … 4ab4e9282f
The idea originally came from when I was looking for a motorhome - a decent one with air-con and other home comforts based on something like a Fiat Ducato or Transit is going to be a similar sort of price but without the room to swing a cat in.