Yeah the underground home's ceilings have to be at least 8ft high because most of the men in my family are over 6 foot tall and the women in my family are 5'7 or taller. We are from the tall hobbit clan ... lolol
I would like to go back to the tradition where multi generations families live together again and small villages of craft people and gardeners. I won't be flipping this home once it's built ;-)