Zenkaya is a prefab from South Africa:

The Zenkaya is delivered completed, ready to live in, to your site right on the back of a flat bed truck.

Zenkaya is for the discerning people who value things differently. Those who appreciate their time and don’t want to spend that unforeseen time and energy to control and manage the construction and design process, especially when it is a far away place.
....
Zenkaya design was based on core sustainable principles. To start with, well proportioned rooms, efficient use of spaces and standard size materials were identified and drawn....

The wall panels feature Chromadek (coated metal) on the outside and either polystyrene or OSB (oriented strand board) on the inside.

In form, the Zenkaya models remind me of the concrete perrinepod.

Last year, Apartment Therapy New York called the homes "stunning."

materialicio.us said:

I love the fabulous ZENKAYA as much as anyone else.

[SPACEOUTLOUD] shared photos of the homes on display at a show in Cape Town.

designer: Zenkaya

Zenkaya models range from 86 sf to 790 sf:

model: ZENKAYA Original

model: ZENKAYA Mini

model: BushKAYA

model: MiniKAYA