That loop is a good idea, if you want to have your ridgeline inside the bug netting.
Like you, I made a Hennessey hammock clone using wilsonbmw's pictures (thank you!). It rocks! I have never slept in a HH before, but even my homemade HH is more comfortable than previous, Speer style hammocks. I will post pics as soon as it is finished (had a scary fabric tearing incident earlier), but I wanted to speak up now because I couldn't believe someone had beaten me to the punch. I mean, the pictures have been up for what, a week? Some of you guys are lightning fast gearmakers!