I think lighter weight leather would be just as durable, would mold better for the pocket and look more proportional on something this small.
I think your edges would look "more finished" if they were beveled before you polished them.
I'm not sure it makes any difference, but I think the snaps are usually mounted with the female piece on the flap.
I think it would look better if the stitching were just a little bit further from the edge.
Perhaps the flap would "look better" if it were rounded to match the outline of the sheath pocket instead of being squared off.
Thanks for being open to suggestions.