Triumph guy, With respect,
I offer you a small idea based upon personal experience.
Buy yourself a Caspian Arms frame and slide
with the safety, slidelock tube integral.
Ask that Caspian mate the slide to the frame for you.
You then can add and fit all the other items as you choose.
Cylinder & Slide or Wilson, or any very high quality hammer & sear set will be the heart of your project, buy the VERY best there.
Pick the rest of the parts to fit YOUR desires & fit them to your project.
Buy your barrel from Bar-Sto or Kart, they's the best. (Bar-Sto will even fit their barrel to your frame / slide - - a very worthy idea)
When you are done, you'll have an accurate, reliable 1911 pistol that you'll be proud of.
I built mine 25 years ago, virtually the same as what I suggest. There's still a LOT of hand work needed, but the really critical stuff I had done by experts.
Today, after many many thousands of rounds through my pistol, it still shoots less than 2" groups at 50 yards and functions flawlessly with decent ammo.
I have never had any parts break, fail or cause problems. I did it right the first time.
Trigger control + Breath control + Sight alignment = Gun Control.
NRA Smallbore Prone Master