Almost 20 years ago I bought a 1911 kit from Numrich Arms (who are now GunParts Corp) in West Hurley, NY. Everything was included and you'll end up with a GI 1911. It comes "in the white", so you'll need to think about what finsh to put on it. (Tip: I just re-finished a Garand using Brownell's Teflon/Moly spray, and it looks absolutely great.)
If you want to add extended mag releases, safties, etc. those are available from just about anywhere.
The Pachmayr wrap-arounds are a must.
Have fun.