I received some Fotos from Mr. Santisak (G) with the roof construction. (see first Foto.)
If the roof need the bracings (pillar) no 2 and 3 then they must be nice done with concrete or a special wood. (horizontal as vertical)
Because they are shown in the room.
There is no hanging ceiling! The ceiling going up to the roof like you can see at example fotos 2,3,and 4.
I hope you will understand my specification. Otherwise just ask G or Jack or my self.