I have done this and it is awesome pull there are videos on youtube with me flying the stack and being picked up off the ground and I am not a small guy. Here is the link in about 20-25 mph of wind http://www.youtube.c...?v=H26N1U3utMA. As far as the link lines go 10' 150# and ten total lines. Don't put one in the center you need that flex to keep the shape of both kites. you can also find me on facebook where there are other videos of me flying the stack in at gusts 4 mph.