I recently picked up a down uq that was another members DIY project. Has 12oz. of 900 fill goose down and a momentum 90 shell, and I even like the color. My only concern is that I might not be getting the full potential out of it as it doesn't appear to be differentially cut. Is there a simple way to fix this? And possibly add draft collars? I can sew reasonably well though somewhat less than straight but i haven't delved into the world of making my own insulation yet. Any prohibiting factors I should know about?