Great looking kit Jake! That horn looks stripped and ready for a project. I've only done one horn before and I am about to do a buffalo horn (ca. 1830-50s). I love that brain-tanned bag. Since you are further along with that horn, I cant wait to see how it turns out and hopefully, I can play some catch up.
I took some photos of my kit as I was preparing for another shooting trip and here is what I have. I have a brace of Navy sixes, one in a Main & Winchester California holster, the other in an E.L. Gallatin-Style. The hunting bag is more of a lined "haversack" style ca. 1850s. It holds my bullet bags, pocket flask, wadding, caps, tools, tinder box, compass, spyglass or bioptics and patch-knife. (I may have posted these items on this site before.)
When going into thick brush and rugged terrain, even the hunting bag can get cumbersome. That's when it is a lot more comfortable to drop the caps, pocket flask, bullet bag and a sack of meal and jerked beef into the coat pocket and proceed as light as possible.
I hope other people post their kit photos also. I'm all about the gear.
-Dave