Load-bearing walls or not

Good day to everyone,

We have bought a house and are now facing the planning stage; we want to fundamentally change the house and enlarge the rooms, but we are facing the problem that we do not know 100% whether the walls we want to remove are load-bearing or not.
We are especially uncertain because of the mansard hip roof.

To give everyone an idea, I am attaching a few files to visualize the circumstances. I hope we can get some help here.

Thank you very much in advance

Certainly not binding. Get a structural engineer...

No, of course not binding. The question of all questions is actually only this. Has anyone ever built load-bearing walls like this at all? I only know them perpendicular to the beams or continuous, that is, spanning several floors. Although I have to say the walls also consist of only one brick thickness.

As it looks, the walls are probably not load-bearing, since the ceiling beams are freely spanning between the exterior wall and the central wall. However, since one must always expect surprises and "original solutions" that may have been implemented in the construction, a building survey should first be conducted, concealed structures uncovered, and things clarified beyond doubt, current as-built drawings created, and then proceed to the remodeling planning.

For this, you should seek collaboration with an experienced architect from the outset, including for the building survey. He will advise you on realistic remodeling options, can estimate the costs, and also recommend a suitable structural engineer. A detailed building survey and well-prepared remodeling planning save the most costs.

It has turned out that it is apparently a bit more complicated than assumed.

The beam lies directly on the masonry wall, and above it on the 1st floor there is also a masonry wall and even beams that apparently support the 2nd floor. This apparently creates a force fit down to the ground floor.

We had an architect on site who advised me as follows.

On the 2nd floor: remove the walls on the side of the house where I want to remove the walls below. So that in the upper attic the beams are exposed.

A question about this. I have now read that such walls were sometimes made in the past as bracing. Can I simply do that?

On the 1st floor: should I remove the walls and replace them with a lightweight partition wall (e.g. drywall)?

Then I should screw a U-beam on one side to the beams and rest it about 15 cm on the outer and middle masonry.

And then I can safely remove the wall on the ground floor.

Does this all sound good? Despite the architect I am a bit worried.

In my opinion, this is more a question for a structural engineer. He should calculate it for you and provide it in writing.

You should invest the money before your roof suddenly ends up in the basement!