If we're going to do creative difficult things with orbital first stages, then I would like to see them used as space stations. 3.7m OD should be nice and roomy

If we're going to do creative difficult things with orbital first stages, then I would like to see them used as space stations. 3.7m OD should be nice and roomy on the inside. Perhaps, a bunch of them could be linked together into a ring? There were ideas like this for the Shuttle's big orange tank, back in the day.