I've seen photos of real beauties that were made by hand. I made one myself, which I'm going to install in a walnut stock with a smoothbore barrel as soon as I get done with the 73,000 other projects I've got going, including a couple which my wife has taken a personal interest in having completed. I wouldn't rate my lock as a beauty, but it's pretty close to historically correct and (the reason for even mentioning it) it wasn't nearly as difficult as a flint or even percussion lock to design and build. With some research you'll find at least a couple of original types that, mechanically, were fairly simple. The relative ease of building them was one major reason matchlocks hung on a good while into the flint era.
Click into the "Pre-Flintlock" section of this forum for much more extensive info as to original designs and gunsmiths who specialize in this field.