Hi Jim, thanks for responding. Earthquakes can be strong in Nicaragua as it's located along the ring of fire. I watched the movie El Barro, Las Manos, La Casa and found it very inspirational. Also, I've decided to build an earthbag house/shed and will start the project this May. As for the foundation, I'll use a rubble trench beginning a course of rubble filled bags below the ground line and continuing the next couple of rows up with the same rubble filled bags. I think the earthbag construction is going to be much more simple and much less time-consuming for the main walls. I've also found a group in Nicaragua working with natural materials Casa De Tierra and they've been an invaluable source of information.