ᐅ Experiences with Floor Construction on Bare Concrete Slab?

Hello, I’m Micha,
We are currently in the middle of a renovation and extension.
So far, we have managed everything well.

However, I don’t have a solution for the floors, as my background is more in civil engineering.

Between the ground floor and first floor, we have a precast concrete slab with circular holes from Dennert Massivhaus.
The ground floor contains utility rooms: heating, laundry room, garage; these are heated but not living spaces.
On the first floor are the living room, kitchen, and bathroom.
The floor buildup is planned with a 10cm (4 inches) layer above the raw slab.
What materials could we use for this buildup?
I have no clear idea about insulation, impact soundproofing, or underfloor heating in the bathroom.
Which systems, manufacturers, or materials would you recommend?
On top, there will naturally be screed and floor coverings such as tiles, parquet, or carpet.

Best regards,
Micha

10cm (4 inches) is quite thin... Do you still need to fit any pipes or cables in there?

No pipes will be installed.

Are the 10cm (4 inches) measured including or excluding the screed and floor covering? Or does it refer to the insulation only?

Is the complete structure including the covering.

I think we can close this topic here.
It doesn’t make sense, as no helpful answers are coming.
It is certainly a waste of time to engage here.