for anyone interested, here's how i have made two insulated hammocks.
it worked great. the first two were heaver than they should have been, partly because the insulation went from knot to knot.
i plan to make another soon that will be insulated from head to just below feet.
the key is to weight the hammock as if occupied.
1st add ccf pads. that will allow you to reach inside if needed. then add what ever else you have to stretch the hammock to near it's full stretch.
when you bring the insulation up from both sides & pin, then hand baste it, leave a little play.
this can be brought up to contact the hammock by 4 cords w/ cord locks. two cord locks each side will allow the shell to be adjusted just right.