Very cool enjoyed watching the clips, tres bien!
Only anachronisn (if you are interested) is the Winchester. They weren't around during the Civil War, it should be a Henry but the only obvious give away is that you show cartridges being loaded in the magazine at the side, Henrys' loaded the magazine at the end of the barrel
I knew for the winchester/henry thing, but loading a winchester was just part of the "esthetic" of the scene, i couldn't shoot it without the winch... SOrry for the anachronism... Anyway, Leone did a lot of anachronisms in his movies, so i'm just making the same mistakes as him

(the most obvious is the buntline special of Mortimer)...