Structure of the room ceiling in Okal house from 1971

I am completely new here in the forum because I hope to get helpful advice from experts. We want to install a 3m long screen and a projector on the ceiling of our Okal house from 1971. Does anyone perhaps know how the ceiling of an OKAL house from 1971 is constructed? I am especially interested in whether I can install these devices anywhere or only on the beam of the ceiling. If yes, then I would like to know how to find the beams. Maybe someone knows a source where I can find the construction of the ceiling. Hermann

This is how it looked in 1969, or rather a general view from that time.

I didn’t find more quickly than that. Apart from that, you can also simply call Okal Haus. As far as I know, they are quite helpful.

My first image was unfortunately not uploaded. Maybe it will work now:

Without knowing the ceiling structure.

I think that a projector and a screen can easily be hung on a drywall ceiling. But according to the pictures from torti, it is even an OSB board which holds even more.

Do a drill test.

This statement is without guarantee :)