@Chloe83 which variant of the roof construction have you decided on? Or is the decision still pending?
"Counterquestion" : are you aware that the value of her answer for you largely depends on the extent to which your "problems" are identical? - keep in mind that contrary to the question in the headline, this is about a complex system of the upper floor layout, ground floor layout, and the ceiling construction method that only seems to be considered separately!
(see also: "Plan change: from concrete to a wooden ceiling")