Many thanks. It answers some of my questions.
George
Glen, the owner of that website is the god of plasticville in my opinion.
Judging from his listings and what I have witnessed through many years of collecting plasticville myself,
I would say-
1- There are many kits and not one standard kit.
2- there are no listings with a first-floor plan or furniture for the first floor so therefore I would assume there was never a first floor with furnishings. Probably because you wouldn't see it with the second floor added.
3- none of the listing show a ambulance so I would assume none came with an ambulance. A blue ambulance he sold went for $312.37 a few months ago. But that what's by itself.