I haven't built a Chambers or a Kibler kit although I like them both. When I started to consider building a rifle after so many years after building my first I chose to build something similar to the first one i built. I chose a Pecatonica parts set, a flint Hawken and I was hoping that some of the experiences I had with the first one would help with the second one albeit nearly 40 years later. What I found was I had to learn some things all over again. It took longer than I thought it would and I made some mistakes but it came out well. I am finishing a Don Stith parts set right now and will build another shortly. One I have parts for is a Hawken I have the barrel, lock, butt plate, Roller triggers, tang and breech the stock is a plank with the barrel channel cut and the ram rod drilled. The point I am trying to make is I had to learn the layout of the rifle, where everything goes and how they fit together and I am not sure I would have learned that as well as I have if I built a Kibler kit. I have considered building a Chambers York or English Sporting rifle and I am sure I will at some point at the moment my focus is on the early to mid 1800's.
Rob