I think that a biodome is a good start, but I highly recommend (naturally) that we get to work on a medical facility as soon as possible.
As we all know, we have a health rating, with a certain point value. That means there will be events that happen that will hurt some of us, but fall short of being actually dead. A medical facility will be critical to healing those players. Presumeably, hurt players will be much less effective in their respective tasks/responsibilities, and of course, at some low point, could even be completely out of commission as a result of their injuries.
I would rather be wrong...Than live in the shadows of your song...My mind is open wide...And now I'm ready to start...You're not sure...You open the door...And step out into the dark...Now I'm ready.