The connections (floor and ceiling connection) on your drawing I find interesting. Do you even have the possibility to properly fix the wall to the ceiling in the area of the roof? Depending on the construction, sound transmission could also be an issue there.
Only the black wall (marked by the arrows) is a stud wall – everything else is solid wood. On the floor, I can simply screw a metal profile into the solid wood (previously covered with sealing tape). At the ceiling, it’s a bit more tricky: here I only have classic wooden rafters spaced 60 cm apart. Here I ask myself, can I just screw the profiles fast? Is it a problem if the profiles then sit slightly crooked? (The roof has an angle of 18°). : Heraclitus and softwood fiberboard are clearly more expensive, right? And one more question: What width of the profiles do you recommend for the above plan?