Hmmm….love looking at these non-standard/simplified types of shelter ideas. Yurts. Geo domes. Cob. etc. One thing about geodesic domes….folks tend to remember them. They stick out like a sore thumb unless you have remote area. At least they do to me…YMMV.
In this case….what about going down…digging for more room. Instead of going up? Easier to keep controlled temperature. Possibly more labor, depending on the soil. And of course it depends on the ability to keep out flooding in some areas of the country.
OldMtWoman