First high open space without knee wall

Yes, this tube-like shape is exactly our concern. The rooms are 4.50 m high and just over 4 m wide. Difficult to assess without having seen it beforehand.

Yes, this tube-like shape is also our concern. The rooms are 4.50 m high and a little over 4 m wide. Difficult to judge without having seen it beforehand.

Why don't you draw the section for yourself? With graph paper and a set square, it's quick to do.

Great, that's what I was looking for.

??? - and why do you then say that you are explicitly looking for examples WITHOUT knee wall???

??? - and why do you then explicitly say you are looking for examples WITHOUT a knee wall???

I thought a knee wall only exists if the roof starts below the "standard" ceiling height. (Yes, there are differences there as well.) So the living space is reduced by the roof.

That this is wrong, I learned in this thread. The OP must have misunderstood it just like I did :)

Oh, now I get it...
Our previous house had exactly those two children's rooms.. highest point almost 5 meters! I thought it was great.. In one of the rooms we built a wide loft bed.. you could still stand up on top. The larger children's room was about 4 x 4.60 meters. Maybe the pictures will help you..

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I thought a knee wall only exists if the roof starts below the "standard" ceiling height. (Yes, there are differences there too.) So the living space is reduced by the roof.

No, a knee wall refers to the opposite: not pulling the hat deeper into the face and, with a roughly shorter-cut gable, pulling the roof slope into the upper floor, making it an attic — but rather, raising the ceiling joists to make the attic more like a full-height upper floor. From the room’s perspective, a knee wall is somewhat a "dwarf wall by other means." There are regions where one of the two methods is traditionally preferred and the other is so insignificantly rare that the terms for the actual "opposites" are used as synonyms. That often leads to confusion when knee wall is said but dwarf wall is meant, or vice versa — I’m used to that. But your misinterpretation of the knee wall as a term for lowering instead of raising was new to me. Thanks for that — I always like to learn new misunderstandings from lay vocabulary ;-)