Thanks for your patience and help.
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I got a great deal on a roll of Climashield XP about 6 years ago and have made several quilts from it. My most used underquilt is a repurposed top quilt, essentially folded in half and stitched. Making all those quilts left me with a lot of scraps though, so last year I made a 7 channel underquilt. It went together pretty good, however the scraps tend to migrate so it's not the perfect UQ. I use it during winter camping trips.
Any other sources for Climashield?
I researched the company and wrote them about the project our BSA troop was doing. They put me in contact with their west coast supplier in Oakland and soon I had a whole roll of it in my garage. I opened the roll and the race was on! That stuff really lofts.
The UQ I made was done like you described, but the channels look like there was a hefty bit of alcohol involved before the stitching started. I admit it, I am a guy and I don't mend straight.:D
I would look for Climashield being sold on ebay or amazon. Twenty feet of Climashield might be a remnant to a contract manufacturer. If it is a thin version, you can just double it.