Tom made some good points in Comments;
Single vs. Double Stack: I thought I was clear about single-stack when I said I wanted to keep as close as possible to the original 1911, and of a utilitarian theme.
Along those lines: 'utilitarian' means concealed-carry, lightweight - so as well as single stack (to cut weight); flat mainspring housing for smoother draw and flatter profile.
Ambidextrous Safety: this will be necessary for my brother (he's a lefty) but not for me.
More to follow . . . S.L.
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