130 m² bungalow with double carport on a 600 m² plot?

Downwards should be north, see image from google Maps. West thus completely unused

The child will also become a teenager or the parents will have guests in the evening, so I find the children's room with access only through the living room less practical.

Who showers in the Gäste-WC?

Above is south ... The expansion reserve in the roof will be for the junior later. The children's room has moved upstairs because we wanted the child to have the mostly light-flooded room and we don't really need that in the master bedroom .. The 6 meter width of the carport/garage probably takes up too much space ... But you are allowed to build it directly on the boundary .. As I said, the draft serves as a basis for discussion and even with the architect we didn't really like the arrangement of the children's room that much.

One must consider that when viewed from below, that is, north to the left, the neighboring property is located there. One must have the 3-meter distance there.

and to the north it has to be 5m? Or do you want it like that?

The 5 meters, the architect said, should be left in front of the carport/garage so that you can also park a car in front if visitors come or it is not driven in.. That’s how it would be done.. But it’s not set in stone. PS: Can this already be in the topic floor plans or is this still the right place for brainstorming..?