Solid Italian marble shelving, 1/4 threaded rod, nuts, bolts, Michael Green 2" solid steel bottom cones and top caps. 397 lbs. of vibration isolation.
To Michael Green's credit, I took this idea from his 'ClampRack' design from the mid/late 90's, and built my own. $800 to build. Not too bad, considering what you get for the money as opposed to the spending tons on a stand less dead.