I had Armand Swenson customize a Colt 1911, just as you noted above, on one of my .45s, many years ago. He had a table at the first Steel Challenge, created by and put on by my IPSC club in So. Calif. I gave it to him there to customize. Bill Wilson attended and was competing. Wison was just beginning to make a "name" for himself. I do not remember how long the job took, but when I got it back, it was one helluva nice pistol to shoot.
I recently sold it to a much younger friend. I know he and his son will get much pleasure from shooting it. Swenson turned out some mighty fine pistols. Great ambi safeties, too.
L.W.