CNC is "white man's magic" as far as I'm concerned.
Are you happy with the resolution of your scan or would a Probe have provided better detail?
Great ingenuity doing a "mirror" to provide the opposite side hammer...……...means the new hammer should be identical to the nearside one.
This could also be utilised in the case of a broken existing part being "glued" together, scanned/probed and cnced. Gives a guy some hope if they had an obsolete firearm needing a part.
Great use of technology. Thank you for the photos and including us.\