Nice looking conversions. I like the darkened grips also. I have two 51 s with long barrels and a 61 with a long barrel that hasn't been relined. I like them all, but I am intrigued by the 5 1\2 " barrels.
Enjoyable video. The dark stain on the grips really make the brass triggerguard and backstrap really pop. I would suggest exchanging the ball cap for something more in the time period, though.