Okay, I had a DeerHunter .50 (same as the Bobcat just mfg. for Traditions) for way over 20 years. Being an old one it had a wood stock & ramrod and used, of course, a wedge key. When I bought mine, early 1990s, it was the best rifle for the money I could find, being just a little over a "C" note. With the brass butt plate & pins yours will be waaay nicer than my birch stocked, plastic BP model.
You are correct about the brass pin being used for the under hammer, I still have mine. Several, or more, years ago I bought a small supply of ss 1/16" pin stock that I've been using to pin just about everything (muzzleloading) that needed a pin. No rust and it worked really great. It's not necessary, I know, just throwing it out there.
From what I can see you're doing a far better job than I ever could. Four of my rifles/guns lack a fore-end cap. And from what I understand they can be frustrating to fit properly. Plus they're really only needed on the styles of rifles that originally had them. All of this you know already.
I am intrigued with your build and look forward to seeing the finished product. The blood is a nice touch, by the way.