Connecting terrace windows with a complex cross-section to terrace insulation

Hello everyone,

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

Now to my question:
At two terrace windows, there is a complicated cross-section, see the photo attached. At the top, the lower part of the window is drawn at an angle; here the window rests on the screed/concrete, but the drip edge is free-standing. Below there are two steps in which the screed or concrete is currently formed. I would like to wrap these into the insulation, as indicated in the sketch. In the upper, narrow part between the drip edge and the screed, there is only 40mm of space.
Afterwards, the terrace is about 100mm lower so that installation with a steep slope is possible.

How would you install the vapor barrier, insulation, KSA, and top layer here so that as few cold bridges as possible form and the entire assembly is also waterproof?

Let me know if you have any questions about my situation.

Thanks and best regards
Dirk