The famous Japanese brand Muji made ready-constructed huts for getting out of the city. They presented the designs during Tokyo Design Week 2015 and these huts will be on sale next year.
Hut Of Wood by Naoto Fukasawa
Hut Of Cork by Jasper Morrison
Hut Of Aluminium by Konstantin Grcic
To learn more about the Muji Huts: https://www.muji.com/jp/mujihut