After a few advices and a lot of thinkings about buildings, I finally choose the “tent” style building. (See here : Buildings, buildings, it is the eighth drawing, in blue)
So I began modeling an example of this style : a single person dwelling :
Here are the preparatory drawings of this specific building :

The buildings are formed of a basic structure with flat walls, floor, roof and metal corners. The walls have windows. Then, outside of it, pillars are added at each corner. They are supposed to strengthen the building and to support the final protection, made of cloth. These clothes are like one way mirrors : they allow to see from inside to ouside, but not the opposite.

Some shader tests (there is still a lot of work to do on that part) :

DL6’s building had to be :
- simple to build
- futuristic
- modulable to adapt to differents utilisations (from dwellings to city hall and infirmary)
- comfortable
- resistant
I think with this style of buildings, it should be ok, but your opinion is as always much welcome !