Yeah, I'm familiar, and I was surprised to see the small hole on the back of the spindle in one of the earlier pics. In fact, I've never seen one with a small hole before. Some sort of ultra duty version or something? The wall on that spindle must be 2" thick (everywhere except the back).
And TJ, yeas, I also considered the 4 post. But just didn't have the room for it. I can barely get lined up on my 2 post. My buddy with the Mori has a 4 post, and it is quite nice as an adjustable work surface just as you describe. I've been thinking of building a heavy welding table to mount on my 2 post for use when it's empty (most of the time), but the heavy tables with 1" thick steel tops going for scrap prices seem to have all dried up. As usual, shortly before I want one, story of my life.