Thanks for the links. I read extensively. To think that years ago, the gear was made in the U.S. and now almost all of it is made offshore. Makes you appreciate the old die hards like Western Mountaineering, Feathered Friends, and Integral Designs and smaller specialty places like Jacks R Better, Nunatak, and Fanatic Fringe.
There are lots of how to's on synthetic quilts, down quilts, even down bags, but it is sure hard to find step by step construction of how to make a synthetic sleeping bag with that shingle construction. I would be curious to see a video of a synthetic bag being produced.