Another thing to consider would be moving the weight of the table+any tooling+material if you went with a fixed head. That table alone is over 600 pounds. Add whatever your working on, plus any vises, fixture plates, etc... You would need allot more motor ($$$) to move something like that compared to a fixed table. I would guess that the acceleration/deceleration times would be considerably longer.
On a side note...I've built quiet a few industrial jigs with flat plate. I've also seen many "cheap piece of junk" units that were not designed properly. These "junk machines" usually made it into our shop for repair. It was not uncommon for a machine less than a year or two old to be useless, because of lack of proper support, resulting in that nice flat blanchard ground plate to look like a banana from sagging under its own weight. My personal advise would be to make absolutely, positively, SURE that you have enough support to distribute the weight evenly, across more than just four corner legs. Add some center legs and adjustment pads on the legs. A ground table is useless if its not flat
I'm sure you've got it all figured out already, but hopefully no harm in me expressing my words of caution.
Hope to see some pics soon!!
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