ᐅ Integrating terrace windows with a complex cross-section into terrace insulation

Hello everyone,

I am currently renewing the insulation on my terrace. I am using Bauder AG4 as the vapor barrier, followed by Bauder PIR TE insulation, then the KSA (screed), and Bauder PYE as the top layer.

Now to my question:
At two terrace windows, there is a complex cross-section, see the photo attached. At the top, the lower part of the window is shown at an angle; the window rests on the screed/concrete, but the drip edge extends freely beyond it. Below that, there are two levels where the screed and concrete are currently formed. I would like to include these in the insulation, as shown in the sketch. In the narrow upper area between the drip edge and screed, there is only 40mm (1.5 inches) of space.

The terrace then continues approximately 100mm (4 inches) lower, allowing for installation with a strong slope.

How would you install the vapor barrier, insulation, screed, and top layer here to minimize thermal bridges and ensure the entire assembly is watertight?

Please let me know if you have any questions about my situation.

Thank you and best regards,
Dirk