There have been several attempts to bring out a reproduction of the Ferguson, including a couple of bastardized "improved" versions. The first problem of course is the cost of the machining (but as far as I know, no one has tried the CNC route).
The second problem. . . picture the stock of your Kibler, with the barrel/lock/triggers and guard removed. Now picture even more wood removed under the triggerguard, and a great honkin' HOLE through the gun, top to bottom. Relatively speaking, there is little wood in the breech area, and they break there.
The third problem is that they are breechloaders, not eligible to shoot in most ML matches, which lessens demand. There's nothing like NSSA for the Revolutionary War. (The situation on this might be different in the UK, not sure.)
Of the repros, the best (and the worst) I've seen were done as one-offs by talented machinists who enjoyed the challenge. The late Naragansett Arms Co did one that has a good reputation. I've had the opportunity to shoot several of the repro versions (I REALLY wanted one when I was a kid!). The gas escaping the breech isn't too bad (not as bad as some of the Hall's, for example), and if you spit on the breech threads when you drop the block after every shot, you can shoot them all day.
