"Finished" is relative, and I recall Frank Miller's wonderful rendition of Delta Lines that he called Cascade Valley RR in OGR and I have the DVD as well, as well as Louis Hertz's magnificent layout in the same media, and am interested in viewing "finished" 2-rail O-scale layouts, including those that utilize the same approach to structures and scenery, even fantasy scenery, that those of us in 3-rail tend to use. There are so few featured in the magazines, although my much older issues of OGR contain some great shots of O-scale 2-rail layouts, with many of them being in B&W, which is fine.
FWIW: I am pretty much committed to 3-rail because I can run so many locomotives on O-72, but like when I go to a museum, I like to see fine pieces of art, and 2-rail layouts are the ultimate model RR experience IMO.
