As in your plans, you can't build the kitchen like that. Your cooking peninsula is only 60cm deep and 1m directly in front of it is the seating area, your girls' long hair would be in the cooking pot :). This cooking island must be 1m deep. I would simply leave out the kitchen wall, the distance from the fireplace to the dining table is too small anyway. The wall in your bedroom is too close to the bed for me, you can barely get up there. The differently sized children's rooms would also bother me, that will lead to discussions later. However, the children's bathroom must be there for three children, we only have two, but we can hardly get into the bathroom anymore, therefore there is a children's bathroom in the new house as well.
Best regards Sabine