Camper/mini motor home

Description:

Looking for something small but spacious enough to live in for long periods as want to travel.
Low mileage and reliable.
Open to self builds.
Ideally would like it to have...
Fridge
Sink
Leisure battery
Solar
Storage
Big bed
Chill area
Will consider anything valued 5-10k.
**would like to p/x cash my way as car is worth around 15k and don't want to spend that much on the van