Company I work for operates 2 747's with 11 pilots. It involves quite a bit of commercialling but is possible. At any given time there is at least one captain and 1 f/o on days off. Occasionally guys will break the 70 hr guarantee, once in a blue moon does one hit 100 hrs in 28 days.
@Cliffatp: difference with Atlas is that at Atlas you need to travel to your base before start of your days-on to sit reserve, for which you also get imputed tax income. First year at WGA should be a big improvement over Atlas if you cannot get based in the city where you live: travel on on-days, no imputed tax, if you are not needed, you stay home longer. Training pay is a lot higher, first year pay is a lot higher.