I built a 50 cal hawkins from a kit when I was in high school.
I bought a bluing kit from a gun shop, it was a lot of work and the results were poor at best. What I would recomend is to prep the barrel and get it ready for blueing then take it to a reputable gunsmith for the bluing process.
Another option is traditional "browning" and I understand that this is a much easier process for the do-it yourselfer???
I made my flinter from the same kit that you are considering. They sure do make a fine rifle. Bluing is a little bit more tricky than browning a barrel. First you have to degreese your barrel repeatedly. I used dish soap and hot water, over and over. When I thought it was done, I cleaned it one more time. Then I used a cold bluing kit and submerged the barrel. It turned out quit well.
Bring them in on a string. I love this term, if you want to be successful on calling in Elk, try not to just sound like the other caller. We all laugh at each other when we are practicing Elk calling at home or while camping. When I first started calling in Elk, I had no idea what i was doing and it's funny how many I could call in. The biggest Bull that I have called in to date was actually my first. I was making cow calls and screwing it up big time. But it's obvious I didn't screw up...