🚀 go-pugleaf

A lot of people obviously feel that Skylab was worth saving.  Was it?
 
Although items such as food and clothing could have been replenished
rather easily, I'm under the impression that oxygen and nitrogen could
not.  Skylab was essentially designed as a "throw-away" workshop not
a real space station.  I assume that there was a comfortable safety margin
built into Skylab, but how much life support capability was left after
the last crew departed? 
 
I suppose that one could have docked an "environmental module" with
replenishable O2 and N2 tanks at the docking port and, with suitable
ventilation, kept the workshop habitable.  Were plans for such a
"life extension" module ever considered?  

--
Dave Michelson
davem@ee.ubc.ca