In the photo below, the RIA GI is on the left, ATI GI in the middle, and my first 1911 build on the right. Let me say right off that I have had zero issues with function and reliability with any of them, so either the RIA or ATI could be an accurate reliable weapon - that has been my experience with both. However, neither are even close to a GI 1911 in my opinion.
As you look at the RIA. you notice the trigger guard is swept back, the trigger is more of a 1911 trigger and not an A1, the thumb safety is commercial style, not military, and the MSH is flat and not arched. On the other side you would see a competition cut ejection port, not military. On the ATI, the sights and trigger are more 1911 style, and not A1, the tab on the thumb safety is larger than GI, and on the other side, the ejection port is cut low and not GI spec. I'm ignoring the grips, although the RIA grip screws and bushings are shorter than GI. The RIA was my carry, until I replaced it with the one on the right.
The clones that look more correct externally, (Auto Ord and Inland) are incorrect internally (series 80 safety), and the others correct internally, have external differences. Being a bit OCD, and wanting a 1911A1 like I carried in the Army, I built my own.
It has post war hardened replacement slide and chrome lined barrel, but otherwise GI surplus parts for a wartime Remington. What you will do just depends on how close to the real deal you want to get with the budget, time and skill you want to bring to the project.