That is not a study, it’s a shower thought with pretty pictures.
I did some incomplete calculations. You can’t try to design a system, or know how heavy a cable will be, if you don’t know the most basic things about designing a cable, which knowledge none of us in this thread demonstrated yet.
It is. Maybe most clouds are below 1000 meters, you’d be silly to design a system that flies at 6 kilometers then. You can’t design something if you don’t know the constraints.