Thanks folks,
Mike, thanks for the post. I understand your comment and that formula very well. I originally drew my plans with that basic formula but did not like the result with the Chambers lock. It is just too big and long and made the wrist too thin. If that lock was 5 5/8" long, I would have followed that formula but I could not shorten the lock that much and I had no desire to use any other lock other than possibly a Kibler. So I shortened it as much as I could, and tilted it slightly. That got me where I wanted to go with respect to the wrist but it also changed how the bottom profile fit. I did not like having the curve beginning at the trigger so merged that curve forward into the tapered fore arm and was much happier with the result.
dave