From my point of view, it is apparent that the OP 0. enjoys searching more than finding a solution; 1. adheres to the widespread misconception that an architect is an overpaid floor plan drawer (in that case, you'd rather contaminate a 900 sqm plot with a shot in the stove, is that clear, right?); 2. on the other hand, justifiably lacks trust that a general contractor’s draftsman would come up with the perfect solution; 3. has a "knack" for selecting unsuitable example floor plans for breeding (one room too few and/or at least one is wrong after rotations and reflections, the desired staircase shape or the like ruins the design, etc.). I haven’t gone through the history of this ragged and tattered thread to see which of the usual suspects among the helpful ones (Katja, Kerstin, Yvonne, Würfel, RomeoZwo ...) have already struggled here with concretely pre-exercised proposals. But as a result, I have the impression that the OP will continue to lack active participation sustainably, so that the project can only continue to drift along as a running gag :-(