Can you rIse the hallway ceiling height and leave the bedroom heights as mentioned? This is your best solution since the hallway is open to the open concept kitchen...

I can see why you are retired Sophie, your arrogance is noted. Your invalid assumptions and snipey tone suggest it may be time to take up knitting or at least find another forum? We have several professionals involved on this high end project. All of whom understand ergonomics. Nevertheless, I was interested in other opinions as there is still an acceptable range within expert views and average heights are on the rise. That said, from a stylistic point of view there is often a push toward lower. Further, the huge range of heights in ready made furniture shows just how much variation there is. Some of it is ergonomically designed, some is not.

I love the general concept of beams and adding beams, but in this space with the ceiling as it is in the drawing, I think adding beams at lower levels makes things too busy architecturally, considering the soffitt and all of the other planes, angles, and openings.

I hope you guys covered the ceiling.