The Rock’s are basically the same gun as all the other Philippine 1911’s, including the Cimarron 1911 I mentioned. They’re all made in the same factory, the same assembly lines.
As you’d be replacing a number of the parts, why pay for them twice?
For my use, I’d be looking at a Caspian frame and slide. Have the rails ‘nitrided’, that way they are pre-fitted and will wear practically forever. After that, a Storm Lake barrel, decent parts for the back end, etc. You’ll have a bit more in it than your cheapo 1911 but it will be a lifetime gun.