I built my first lock with the instructions included in the chambers part set. no books or anything else. after filing the gates off, drilling the holes and doing the heat treat as instructed you`ll be fine. if you are remotely mechanicaly inclined and understand that tiny drill bits flex while drilling.....you`ll be fine. its not black magic, its logical, mechanical physics. yes you can screw it up. but its steel. you can add more with a welder and re-drill and re-tap. you can re-heat treat. if necessary you can make a new part.
.....the rest of the rifle.....
i built my first one with no book, just this forum. it is not pretty, it is not ugly. it may possibly represent the guns that don`t exist today because they were utilitarian, made by the user who recycled parts from other guns or whatever. it is not, definitely one of the high end beautiful rifles like members such as Dave Person and fletho build. but it works.