Do you use a beam in the middle of the 6 meter square living room in the middle of a rural house?

The area of 30 square meters is too large, and if there is a beam in the middle, it can be beaten, reinforced, and the stability of the building.

Beams should be added, which is safer and can also play a role in the later decoration (add one in that bathroom and that place according to your floor plan).

Yes, but if you want to lay bricks on the dark beam, add 4 steel bars and stirrups, and the force can be guaranteed.

Theoretically, yes, but in practice it depends on the situation on the spot. If you want good air permeability, you can just make a bay curtain.

Door meters (width, height), window meters (width, height).