There is good information from CleanTechnica concerning the developmental status of renewable energy in Central America.
The building has an self-supporting internal structure made from laminated timber with metal mounts, 200mm insulation and a 9mm fiber concrete slab covered with liquid rubber as exterior finish. On the inside the structure is covered with birch plywood which gives an impression of a warm, homely atmosphere. Both frame and filling for the dome are prefabricated and assembled on-site. The perimeter of the house is covered with pre-prepared foundation insulation. The dome utilizes its shape to provide natural ventilation.