My dad has recently converted his work van (2015 Transit Custom) into a campervan. Sleeps 2. It was a mixture of some work being done by a friend who does conversions, and the rest being done by himself. It helps that the van already had windows on both sides. It looks remarkably similar to
@DarloRich's inside, but without the extra seats as there isn't enough space for that.
My parents took it over to Sweden for two weeks earlier in the summer. I'm told it was excellent.
(I should note that my dad runs and owns a small business in the automotive parts sector. So he definitely didn't have the long-term intention of buying the van from the company at a knock-down price to convert it. Nor was that particular van chosen specifically for its suitability for conversion. Definitely never crossed his mind...

Pretty sure the van was bought sometime in 2017, so definitely a long-term plan!)