I worked on building a school in Uganda. There our main issue was being able to afford the cement and corrugated roofing. The bricks were made from baked clay

I worked on building a school in Uganda. There our main issue was being able to afford the cement and corrugated roofing. The bricks were made from baked clay and basic tools were the same as used in small agriculture. We took rocks from the ground and smashed them up to give us hardcore. Labour wasn't a problem as the entire community pitched in. Prefabricated structures just weren't affordable at all. Taking free building materials from nature was key. The transport and cost of cement was our constraint. This project uses a prefab structure, either on a prefab or poured slab foundation. That doesn't seem readily transportable by boat as they state. Rather than just using local materials for finishing a better solution would surely be to come up with ways to use modern construction methods with locally sourced materials.