You may look at a Hijet and think its small but they are well know for their Tardis properties! They are often converted to camper vans, micro campers and day vans, while other have been practically lived in (see Mongal Rally Hijets). You can convert a Hijet pick up to a Bambi Camper as used by the old Bedford Rascals which are now getting old, rotten and unreliable. With a 1.3 16v injection Hijet you will get fantastic performance, fuel economy and reliability to make you micro camper make sense.
There are many VW lookalike camper conversions knocking about, concertina pop up roof conversions, and whatever the owner can create in such a compact space. Some have cooking facilities, double beds plus a kids bed, toilets, showers and awnings.