I have a Ruger SR 1911 Talo, with a rail.
A couple of points to consider, since you have a Ruger...
First, about buying an "aftermarket" frame. It MAY not fit. I do not know about the Ruger 1911s but I do know some makers of "1911" guns have
"proprietary" frames. My son's S&W is like that. Uses stock spec GI magazines, but at least some of the other parts are just enough different that you must use parts made specifically for that make & model gun.
While I didn't do a detailed investigation of my son's pistol (S&W 1911PD) I did check it out, and industry standard grips will not fit it.
On that gun, the grip screw bushings are about 1/8" farther apart than GI/Colt spec guns, so standard grip panels will not fit. You must use grips made for that S&W gun.
As I said, I don't know for sure about the Rugers but I think it is likely they did something similar, and its something you should check into. Its not impossible some of the other parts / Frame dimensions are "Ruger Only" and do not interchange with "regular" parts. IF this IS the case, buying someone else's frame hoping to put your Ruger parts on/in it might be a waste of money.
Another thing to consider is Ruger's repair policy. From what I understand, the current policy (and has been for the past few years) is that if you send your gun to Ruger for any work, they will return the gun to the condition it left the factory, which MIGHT mean if your frame modified gun goes to Ruger , it might come back with an original configuration frame. And, it might have your frame's serial # on it, with Ruger keeping (and destroying) your modified frame. It is within their legal authority to do that.
Just a couple of things to keep in mind.....