Looks good, Tom
And, it's a very clever idea.
It appears simple enough that even I just might be able to do one.
I can readily see the need for;
A.) Getting rid of that powder horn, as good looking as it is.
B.) Having a small, unobtrusive, container in your shooting bag for a days hunting.
C.) And, of course, that added morale booster that comes with "I made it meself"!
Uncle Russ...