1775, You will need the jig and some of the other tools to do those. You have to cut the rails and drill some of the holes to complete them and really you can pick up essex or RIA frames complete for the same price normally. There is still a lot to building a 1911A1 from parts as even my Caspian Recon frame needed some of the pin holes re drilled to the right size and fitting the slide to frame is some work. The barrel was easier to do but required some filing and a few different size links to get it in there. You might want to try assembling a kit first before trying to mill the frames rails....
https://www.stealtharms.net/1911-series.html
https://www.stealtharms.net/1911-series.html