its been discussed many times - search will find it, but i haven't seen a diy effort yet. I like the idea of a normalized fabrication filled with epoxy and stone as a machine superstructure... maybe one day will get to it, until then its hearsay, at least on my part. the worlds best tool manufactures do use it, hardinge for example or some of the extremely sensitive and precise optics equipment manufacturers, millionth of an inch stuff.