I remember when the artists renderings were released of the ATF prototypes, like the one shown in your first pic. At first glance, I remember thinking, the butterfly tail and chines are obviously the Lockheed design and the FAT F-18 is obviously Northrop's. Then I read the article and noticed I had it backwards. I was expecting something radically cool from the Skunk Works. Oh well.
Cool pics, the bottom one is my favorite.