[Crex]

Not much left to say. Lots of good points/info (from a lot of good sheath makers). I, too, learned and continue to learn much from Poppa Sandy. Turned my concept of leather work completely around for the better. Got to agree with the loop skiving and location, elbow obstacle for us short guys. I also like a more enclosed pouch.
I would think that the double welt would not be necessary if the sheath is wet formed around the knife a bit more (thicker just makes stitching more difficult). Esthetically your lines are good and that shape could be maintained even with a deeper pouch configuration with minor modification if desired.
When it comes to emergency "quix draw", I am prone to reach for my .45 Long. She's faster, cuts deeper and longer, and helps maintain a respectible distance to allow more time for rational thinking.