Hey carveone, looks great so far, I seen your thinking on which lead screw to use, Dont even think about it, get the acme 2 or more start, youll only want to change it right away if you use the allthread, take it from me and many others that did the same, I only have the 1 start but my next machine will be more, davids plans are awsome and can be adapted into other designs. Have fun with the build. Graham