Hi, there are several earthbag homes and water tanks in Vanuatu that have been built since 2012. If you visit the sites around Port Vila you may get a better idea of what you want to build. All of the buildings are certainly strong enough for a category 5 cyclone and small tremors. There are trained earthbag builders in Efate, Tanna and Santo who would love to get some work building if you need some help. We will be helping with a big build near mele in December. This will be our 4th house over there.
The first house we built was round and I can tell you it wasn't well received by the locals. They really don't like the round houses. We didn't do conical roofs because of the problems in a humid climate they become quite damp on the inner walls. Let me know where you are building and if you need any help.