I only venture into the section on an occasion, am glad I did this time. Hope you don't mind but this idea (and possibly floor plan) are getting stolen, err borrowed. I need a hospital for my ATZ games and I like the idea of having it built in "Phases" that you can use separately or combined.
I am already sketching out an idea for Phase 2 that will have the cafeteria, additional ER Rooms, a morgue (possibly), along with an additional hallway leading to Phase 3 (while will be additional Patient Rooms, Offices, and the stair well {removable} leading to the second floor (stage 4-6, these will be additional Patient Rooms, an OR Theater and maybe an office or two). I may have a lab and dispensary in Phase 2 or 3, don't know yet.
Again I like this idea. Going to have to go purchase some foam core from the local dollar store, if not for the walls, then at least to get the basic floor dimensions figured out (the advantage of using cheap $1 foam core sheets, you don't have to worry about if you mess up to badly).