I am thinking of buying a Colt M1991A1 for CCW in 45 ACP.
-A good choice. 1911s conceal well because they are flat. And my 01991 was excellent.
I am thinking of new Wolff springs, Ed Brown extractor, ejector, round butt conversion and FP.
There is no reason in the world to replace the stock Colt springs, extractor or ejector. The stock springs are fine, the Colt extractor, firing pin and ejector are quality parts machined from barstock. Make sure you handle a "bobtailed" 1911 before you have the conversion done, you may not like it.
I am considering a two piece full length guide rod.
-No reason to do this, either. Furthermore, a two-piece guide rod can shoot itself un-screwed.
I like a flat MSH.
-It already comes with one.
I am interested in your general comments and suggestions for night sights.
Just get some Trijicons. If you don't mind machining the slide, Heinie Straight-8 night sights are even better, but since you want a stock-looking gun the Trijicons might make more sense for you.
The finish is matte charcoal.
-I think you mean blued. Current 01991 series guns are either blued or stainless, and you want to get the current production 01991 instead of the older ones.
My only other suggestion would be to have it de-horned if it has any sharp edges and maybe have a better bevel put on the magwell.