Sorry my paint skills aren't that great and you will have to imagine the bug net. The shock cord is located inside the bug net to keep the drape off of you when shock cord is tightened. Also I like this method because it will move and stretch when you change position as you sleep ( like the sides do) .
color codes :
Pink : continuous light weight shock cord with cord lock at the top going through grosgrain loop tabs
Red : 1/2" grosgrain
orange : ridgeline
blue : sewn side of bug net
green : zipper
In the illustrations you can see how the foot end stretched with the side while the head end didn't have that much stretch going on.
I hope that these illustrations helped
Dave aka WK2
Cubmaster of Pack 640 - Smyna, TN
Eagle Scout 1992 - Troop 86 Brentwood, TN
Tread Lightly and Leave No Trace