I got this 4/4 slab from Shamrock a while ago. It was warped about 2" end to end and had about a 3/4" twist. There was nothing to lose so I experimented. I wet it down (soaked it) and clamped it to my workbench. I sat there for about a month with me adding shims and water to try and get it flat. Surprisingly it did flatten out prett well. I laminated 2 not very good (but flat) walnut boards I had to the bottom of the slab and I think it will stay flat. It's not pool table flat but it's as close as i could get it. The base is also walnut but I stained it with a dark gel stain as I wanted to keep the focus on the top.
Here's the finished table:
pete
Here's the finished table:
pete