You probably mean a dormer here by Gaube. That is relatively simple, even if it just rises laterally along the room walls. Where/how did you distribute the extra size compared to the prototype? I would vary a building proposal from your builder in your place.
On the ground floor, I distributed the rear and front parts almost 50/50, based on Pine Forest variant 1. On the upper floor, something could still be improved; I just see it’s not well distributed. The office, hallway, storage room, and stair area are too wide. The goal was to distribute everything approximately evenly.
My builder advertises free floor plan design; taking an existing floor plan and redrawing it was one possible solution.
Exactly meant dormer.
What do you think about removing the dormer, setting the roof pitch to 35 degrees and the knee wall to 140?