Thanks The Allusionist and Pradipta,
now I have two solutions: the pergola one with little enlargements of the structures and the last one, which has on top the box extension.
When the client is more decided to chose one of this, I may go to the Southern Italy to take more info about the place and other stuff. I will do all the 2d plans to submit to the city hall department.
I can say now I like the one level project: it's more rural integrated, even if I'm using the white to jump up to the sight.
Regards my friends