Open roof truss or ceiling?

Okay, I suppose the roof structure as such will not be visible anyway, since it will be insulated and clad and then it will be white. That would be possible afterwards if necessary via a decorative beam ceiling. Our primary concern is also the greater room height.

Why? With above-roof insulation, it would be fully visible.

Well, fully. Rather two, three rafters in each room.

Plus formwork, and probably rather 5 rafters...

Then five... but only a third each... Has nothing to do with the image linked at the beginning.