Would you get pullets or hens?

[Lilion]

The run is big enough for 3, at a bare minimal level. The coop not having enough ventilation is problematic as well, and if this is a prefab (depending on design) it may be near impossible to add enough ventilation.

If you get more, you must expand. Simply not enough room for additional birds, plus there's no way to safely integrate in that tight of a space. Integration takes more room than the minimum recommendations, which is meant to cover the basic needs of a flock that tolerates confinement and that already get along.

I do know the run is small, but I'll be letting them range a bit more after they're used to it. I have no intention to get more chickens anytime soon and, as I said, this coop is temporary.