I ran into an interesting take on tightening up the 1911 in an old gunsmithing book ~late 50's. It speaks of welding up the hood and refitting to give an idea of the era. Anyway there was a rather novel take on slide fitting to me at least given my limited experiance. Rather than peening and grinding the rails it suggest cutting the front leg of the ejector short, enlongating the pin slot and spring loading it. ~.050 just enough to put pressure on the slide, for a spring 3 or 4 coils of a plunger spring. Also suggested spring loaded pins thru the feed ram webbing to tighten up the lateral slide slack.
Did I trip into some old no longer valid information or a rather interesting tidbit from the dead seas scrolls of gunsmithing that works great but was long ago forgotten about.
Thats interesting stuff. I don't plan in implementing any of it, but if in a life or death situation I'd give it a go.