Unfortunately, I can't fully represent the whole thing 1000%, my program can only handle one decimal place accurately. I also didn’t map every detail, just the key points. Some I changed on my own authority right away, others I deliberately left in for discussion.
By the way, I find such a scribble sketch from the manufacturer at over 500K somewhat strange, but okay.
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Overall, I find it quite okay. A few bottlenecks still need to be fixed. First there is the wardrobe. Here a cabinet 50cm deep and 1.50m wide is shown, which would already be more like a mini wardrobe. But even that is not enough. In my opinion, the guest room has to become narrower here.
Also, you can hardly get past the sink in the guest WC (shown here in standard size). When stepping out of the shower, there is hardly any space to dry yourself - that is very cramped. The utility room is with 5.3m² also below average. What is supposed to go in there?
In the extension, I only wonder if this laundry room cannot somehow be removed and the machine better integrated into the bathroom? What is this KBE? The controversial ventilation system? If so, you might want to assert your interests a bit more resolutely.
I once recessed the wardrobe into the wall - for that, the hallway is only 1.20m wide. I find that better than just an 80cm shower or something similar.
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Upstairs, as suspected, the bed is depicted much too tight in your sketch. Here you can clearly see that behind the door it is impossible for cabinets to stand if you want a standard bed. By moving the bedroom door, the utility room also becomes bigger, which benefits it.
What is the purpose of this door leading to the back in the intermediate building? Does it have to be there?
If it were mine, I would choose this position for the technical room and expand it further. A bit wider, so that a wardrobe can fit in the extension and the technical equipment in the room behind. For that, the technical equipment inside the house would be removed. With the gained space, I enlarge the living room, workspace, and the guest WC.
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Of course, the question remains whether this is technically and financially feasible.