The plan was to build more of them, of course. (And of course the first ones would be smaller than later more ambitious ones.) See e.g. https://en.wikipedia.org/wiki/The_High_Frontier:_Human_Colon...

Non-popularized version https://space.nss.org/settlement/nasa/75SummerStudy/Table_of... (but that was the very first study iirc and made some known mistakes; I have no idea what the state of knowledge is now.)