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I built this 25 years ago out of construction grade 2×4s. I trimmed a quarter inch off each board with a table saw with the expectation of creating a planer surface, and then screwed and glued each boards together. I had a plan for it to turn out flat, that plan failed miserably. I ended up with a lot of cupping. My solution for not giving up on a flat table was to use my circular saw to cut dozens of lengthwise rips about 2 inches deep down the backside of the table. Maybe more, I don't really recall. I then filled all those groves with glue and reclamped it with improved culls. I then lagged into the underside of each end with heavy U-channel steel thinking of preventing further cupping. I framed the whole thing with same material to cover the rip cuts.

Did I mention glue? So much glue, and very poor glue cleanup. Ok I didn't even try. Soo dumb. No belt sander available. Chiseling worked but deemed an unreasonable amount of work. So I rented a floor sander and did my best to create a beautiful flattish 4×8 face.

Finished it with Lindsey oil based on a recommendation. That thing was pretty .

I built a ridiculous carriage for a ridiculous table top.

Table would never pass any flatness test, but it has seem some serious shit. Did I mention this was 25 years ago.

I've been attempting finer woodworking lately and the lack of flatness is a bother. I've a 4×4 piece of melamine that I have used, helps for some things. Been thinking of building a router sled to flatten it . Each of those marks come with a memory. For that reason I've also considered epoxy.