I'm probably spending way too much time looking at Google Earth,
but...

Has anybody done a basic facilities analysis of Area 51 to see what
the working population is likely to be?

That is, ignore the hangars, the Secret Airplanes, the flying saucers
etc, and just ask how much people-related floor space there is there
for people purposes.

A resident population, or even one that just stays there for a few
days at a time, needs living areas, office areas, probably dining
halls, etc.  I'd guess that somewhere in the architect/facilities
design communities there are handbooks that provide guidance on how
much floorspace is needed for such things. If such exist, they might
be used in a back-engineering exercise by identifying living, office,
dining buildings at A51, measuring the square footage, and coming up
with a rough estimate of how many people the place looks designed to
support.

Has anybody done that?