Dennis,
Craig cleared it up very well.
Some thoughts on your project:
1. If you prefer the 3 screw OM 45 large frame I won't complain. Especially if it has wear, you'll likely reblue it anyway I suspect. And if your only planning 2,000 PSI loads the OM mid-frame is easily converted to 45. NM and OM 45 barrels interchange if you don't want to go with a custom barrel.
2. I have the same problem with black sight on black target, or in the dark woods. I like a gold or stainless insert in the front sight, but not a bead, a square insert so what you see in the rear notch is all gold or stainless. And not polished that would reflect the sun in your eye. But something like a 240 grit finish or serrated like the front sight blade is now (50 LPI) to match the Ruger serrations.
3. Stainless grip frames can be blued and I can recommend a couple of places that I used like for the SBH Hunter SS grip frame with round guard if you like the SBH size. Otherwise I recommend the SBH steel grip frame used on the 5 1/2" and shorter SBHs, the XR3-RED SIZE. All Ruger grip frames interchange as far as the screw pattern. And the NM grip frames are easily adaptable to OM main frames; actually it's just the trigger return spring.
The NM flattop grip frames are steel but are the oldest Ruger the small XR3 SIZE, the 'Colt size', and I like them best but not on my 45 for level 2 and "Ruger only" level 3 loads.
Grip frame sizes:
A 45 Vaquero I built with SBH hunter SS GF and hammer, 5 1/2" barrel with long ejector housing: