I'm not surprised to hear that the yuki case is NG. For anyone wishing to build a quality franken, I would definitely recommend staying away from the yuki case. When I sourced my components for my 6538 build, I found a 1030 donor watch (I forget which), and I went with a more expensive Vietnam case. Other than that, I used a gen crystal, gen stem, gen crown, gen tube, etc. All in all it turned out to be a great looking watch.