I have no
hands on personal experience with the Cabin Creek gun and rifle kits. I think the OP would like to hear from people who have.
However, I
do have experience with locks from Cabin Creek. Brad Emig, the proprietor, advertises his services as "The Lock Doctor," and kit descriptions indicate the locks that come with those kits have been tuned in the Cabin Creek shop. I sent him two problematic flint locks, one from Pedersoli and one from L&R. In a remarkably short time and for a very reasonable price, I received two locks which I believe function as well as any you could expect to buy. I have no doubt that if you order a Cabin Creek kit, you will get a fine lock with it.
Kit descriptions on the Cabin Creek website give very precise stock dimensions regarding drop, cast, and length of pull. This indicates a great deal of the shaping has already been done, and the descriptions also state much of the inletting has also been done. I believe Brad and Shane design at least some of the hardware that goes in many of their kits, and have these parts cast to their specifications. It is my impression that these really are carefully designed and thought-out kits rather than parts sets, but I will admit I have not personally bought and assembled one. Not yet, anyway.
@Alexander Efremenko recently sold a Blue Mountain rifle, stocked in ash, which I believe he said he built from one of the Cabin Creek kits. Alex is a professional builder himself. If I were seriously interested in knowing more about the Cabin Creek kits, I would send Mr. Efremenko a private message and ask him his opinion. He would know from experience, and could also give some professional insight.
Best regards,
Notchy Bob