Good catch, DivaB. I mistakenly referred to my gray insulated pod-like over cover as a "sock", when I've generally called my sock-with-a-floor a "sock-tent". Sorry for confusing the issue.
You're right that having the adjustable strings on the hammock made it difficult to attach the insulated pod. I used velcro to connect the top and bottom parts of the pod around the strings. I don't recommend this, although once the pod is in place the strings can move freely between the hooks and loops as I shift my weight, making charming little velcro ripping noises as they unfasten and fasten again.
The tension makes the velcro re-fasten, much like the bottom entry of a Hennessey hammock. I used this design so I wouldn't need to insulate the end compartments, which make great storage for clothes and also keep the strings from tangling. I think a better approach would be to make something more like a peapod, even though it might be a bit heavier.