Never thought this deal would materialize, or be as described; but I was wrong on both points.
Many thanks, Josh, for taking the time to put it together.
This is my first run-in with a really gossamer fabric, and did not expect too much.
But it has reasonable strength for a sleeping bag or quilt that will be treated carefully, and enough DWR not to wet out immediately on contact with moisture. Was looking for something super light for the shell of a bag using 3M Thinsulate Liteloft for insulation that like down, would be compartmentalized, but not sewn or otherwise affixed to the shell, in an effort to allow all of the insulation to maintain its maximum loft.
The challenge is figuring out a way to baffle it in a manner that will conform to a differential cut, not add significant weight, and not fall apart when washed.
There is an old Holubar down bag kit in the store room downstairs that might yield some clues.