If you need or you want to make the same Green Shack that Stephen Lamb and co-designer/artist Andrew Lord made in Cape Town, you can. It will have features:
The corrugated-iron (four wall) structure is lifted off the ground in order to prevent flooding of the basis of the Green Shack.
The two walls that get more sunlight support vertical vegetable gardens. Plants in the vertical garden are supplied by gravity-fed drip irrigation system. This means you don’t have to pay a lot of attention to them. All you need to do is to add more water when the water tank is empty. Those two walls, also acts as the temperature regulator and they provide food. Also, they are useful against fire.
Light bulbs are made from coke bottles (recycled) filled with water. This is necessary because a Green Shack doesn’t have windows, for security reasons.
The other two walls are protected with bags, filled with earth or sand. They also have a protective role against fires.
Maybe the best feature is capturing rain water. It is captured off the roof and stored.
Basically, this is just a basic of a Green Shack. Depending on a budget and capabilities, a person can customize his Green Shack to suit his needs. It would be useful to add some solar lamps. They are cheap and because a Green Shack doesn’t have windows, they are needed. Those improvised bulbs aren’t very effective. Because a Green Shack is quickly made, from recycled materials and it doesn’t have some good protection against natural elements, often check for damages.