If you are building in the states you will have to go to a remote location to avoid codes and inspectors, but you can build many small structures that fall outside of code enforcement. 100sf. is the limit usually. That could be multiple 10ft diameter domes, but there are limits to how much land you can cover because of water shed. Super adobe is a cheap alternative especially since it is so energy efficient, and your site is your building material. Super adobe structures are about ten degrees cooler than the outside temperature without any cooling, and they gain thermal mass for heat storage in the winter. Oh yeah there are already plans with engineering notes for two different larger structures.

Here at Cal-Earth the largest of the two is 1850sf of living space and another 600sf of garage space. It cost roughly 50,000 to build and appraised at over 300,000. The plans are available at Cal-Earth. This structure has passed all of it's inspections with the building department here in San Bernadino county California (This county has one of the toughest building regulations on the planet), But all of the material is available to present to the building department.