Gentlemen I humbly thank you for the compliments.
I have 4 or 5 of this same design on order for spring.
Frenchman, the welt width needs to be appropriate to how far your stitching is from the edge. I usually just eyeball it with my dividers but I would guess 3/8". Dampen, double it and tap it with your harness hammer. You can also fill it with a cord.
I usually do most of the finish on my leather in pieces and then sew.
Edge binding is done after the body is sewn.
Mark, IIRC this pouch came out black. The photographer was really awful and his equipment was even worse. Should have been fired.