There’s links out there, I’m sure, but all you’re doing is sewing two pieces of ripstop nylon together with a solid piece of insulation between them.
The Climashield, conveniently, comes in the same 5’ width that the ripstop comes in so that makes things real easy. The toughest part of it is laying it out so the insulation winds up inside the quilt
(well, that and all the damn pinning that’s necessary to run it through your machine)
I don’t remember the length of mine, but cut two pieces of nylon and a piece of insulation. One piece of nylon and the insulation will be the same size. The second piece of nylon you need to sew a 1/2” hem in one end and then cut to the size of the other (not counting the hem + another 1/2”). The hem wind’s up being a channel for some bungee cord so you can draw up the end for a footbox.
Layout carefully and pin it together (I seem to recall pinning one side at a time worked best for me).
VERY IMPORTANT.....the hem you sewed earlier for the drawstring MUST be folded INSIDE the two sheets of nylon and with the extra 1/2” you allowed for in measuring so that it doesn’t get sewn shut.
Sew both long sides, all of one end and each outer 1/3 of the other end like so....
(I cut my insulation to leave that but sticking out to aid in this next step....)
Now remove all pins. Trust me...this is important....
Now reach your arm through the two layers of nylon all the way to the bottom, grab the nylon and insulation and pull all the bag back through the hole. Now you two layers of nylon with the insulation between them.
Now just sew up the hole you used to pull the insulation through to make it a n insulation sandwich with nylon bread. Make sure you catch the insulation with you sewing.
Now sew up about 18” to 2’ of the end of the bag with the channel to form the footbox and insert the cord to close up the end of the footbox and you’re done.
Clear as mud???