Maybe another point: Are there any problems with monolithic construction combined with large window areas?
What problems should arise from that?
With monolithic construction, you won't get around cladding the lintels and ring beams with insulation materials. I have never seen it done differently so far (since 2002). And with 40 cm walls, there is still enough space for insulation next to the lintel.
The size of the window areas has no influence on the energy saving ordinance or on meeting the requirements! Although you have a higher heat demand depending on the orientation of the glass surfaces, i.e., with less window area, the energy saving ordinance simply compares the component properties and not the size of the window areas or the dimensions/volume of your building.
This only becomes relevant with KfW40+ and passive house standards.
I also see the flush wooden facade critically. It should work with the slate elements. Flat cladding bricks or slips have a build-up height of less than 2 cm. This should be able to be accommodated instead of the plaster.