I pondered a long time, and still made regretful decisions! My only advise would be to plan well, and stick to it. I made a few changes half way through my build, and it always created some compromises. Regarding the twin screw end vise, I don't think the racking is really that big of an issue. In fact, it can be controlled a lot by having the two screws. I planed a 2 degree angle to the chop face, which squares up when tight. Here is the under bench pic.IMAG5336.jpgIMAG5337.jpgIMAG5340.jpg