Better off dropping $1200-$1500 on a Dlask... Pretty much a custom build anyway.
You need at minimum a matched slide and frame or you could end up paying a bunch just to have those fit properly. That involves welding and recutting the rails. Better off when it's done right from the start.
For the small parts, no point chimping out on MIM if you are having a smith fit it all. EGW makes forged everything, I think Wilson does too with the Bulletproof line. Won't be cheap either way.