NOMAD Micro Homes

nomadmicrohomes.com

NOMAD’s living room, kitchen, bathroom, stair, bedroom, and storage are all seamlessly integrated: a stair doubles as a kitchen, a window adds light to one area and a higher ceiling to another, a bathroom doubles as a shower, storage that can be used as seating, and so on. These features are not obvious at first glance, but each one is essential to NOMAD's livability.

NOMAD "Live" becomes NOMAD "Zero" when the following pre-engineered sustainable features are added: 
Solar Power
Composting Toilet
Rainwater Collection
Grey Water Treatment

They also offer upgrades . . .
Increased Wall and Roof Insulation
High Wind Loading
Triple Glazing

http://www.nomadmicrohomes.com/models.html