The table itself is two pieces epoxied together using west systems epoxy found and most boat stores or online with some microfiber added for filler and strength. I used some clamps and sheer weight to fuse the 2 together. It's roughly 400 lbs
As far as using a self leveling type stuff on a skim, I didn't go down that road. I think the sagging comes from weight and gravity. But it's within spec I need. Most my items aren't crucial but the few that are, are small enough to where that's not going to matter. We're talking tenths of thousandths variation when your only moving half inch.
For that matter I use fixture plates and mark where they go on the table and then surface them in their home spot. Haven't done it yet, but that is my plan for other parts in future if need be.
As long as my dual 6 inch vise is level x and y, the table dip doesn't matter much. I have I believe 10 or so inches in my vise as a single station so I can do parts quite large
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