ᐅ Roof Pitch and Knee Wall Height When Planning a Flat Dormer

Now I finally dare to ask a question, as my ability to visualize often lets me down...
We are currently planning the floor layout for a solid construction with a general contractor. The regulations in the development plan are as follows:
Floor area ratio 0.4
Plot ratio 0.8
2 full stories allowed – ridge height 8.80 m (29 ft)
Any roof type allowed (except barrel and pagoda roofs)
Gable roof 30–45 degrees, hip roof 25–35 degrees permitted

After initially having a rather long wish list (open space, window seat, bay window/dormer, open straight staircase) for about 165–170 sqm (1780–1830 sq ft) of living space, we have already made some compromises. What remains is the desire for a dormer with a window seat on the upper floor (similar to the example photo).
Now the question arises regarding the optimal ceiling height and roof pitch. Our general contractor has been trying to convince us to go with 2 full stories (for practical reasons?). For us, however, 2 full stories would only fit a city villa style; a gable roof starting at 30° on a 2-story house looks very bulky to me. Am I right? I can’t quite imagine how a 25-degree hip roof would look with such a dormer.

So, in my view, for the roof with dormer, the only options are:

• Gable roof with a minimum pitch of 30° + knee wall height 1.8 m (or higher?)
• Gable roof with a steep pitch of 45° and knee wall height 0.8–1 m
• Hip roof pitch 25° with 2 full stories or 1.5 stories with a high knee wall

We are currently stuck in our thoughts; we have looked at different knee wall heights and roof pitches, but we are unsure which would be the most suitable for the dormer. Our general contractor is very practical and, as mentioned, would prefer 2 full stories (for furnishing reasons) plus at least a 30° roof pitch for the use of a cold attic space. But wouldn’t that just be a bulky box?

I’m looking forward to hearing the opinions of the forum experts here... 🙂