The triggerguard is the "K5" triggerguard. You can make durn near anything out of it. The buttplate is from Reeves Goehring.
"how did you arrive at the profile?"...with difficulty. Lots of figuring, studying, thinking, and worrying. I came up with the only way I could think of to make it work. The wrist is very diamond shaped. I know that it is supposed to be. It is the only way to make the wrist to comb transition when there is no "scoop" or crease at the nose of the comb. The Neihardt guns I have seen (in photos only) show no crease here whatsoever. It's very different, for sure.