Are there physical limits to the dome size? I understand you were going for the tiny house vibe, but I think a "great dome" and slightly larger connecting passageways would give a nice feel to the ho...
No but once you get to about 20 feet in diameter I think you need double rows of sandbags. Keep in mind that the effort level goes up exponentially, i.e. a 16 foot dome is way more than double the effort of an 8 foot dome