The project is for my niece. Framing a piece of 4'x6' 3/4" plywood to be a kind of mini stage -- but the plywood is a bit warped. I figure I'll cut a channel into these and frame the plywood with them, forcing the plywood to seat flat in the channel.

Or maybe I'm over-thinking it. I tend to avoid screws in my construction now, but I could just build an under frame for it and screw it down. Hmmm.

The channel approach has the added benefit of concealing and protecting the plywood edges. It'll certainly look better that way.

Still leaning towards channel.

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Okay, maybe new plan: Do the simpler underneath frame.

Seal the plywood edges with drywall mud. Then paint the edges and outer frame.

That'll make the final step simpler: gluing on vinyl sheet flooring and trimming it to size

Instead of screens, maybe glue and a lot of clamps? Ply isn't that strong when it bows, so it should be feasible

Glue def happening no matter which approach.

I did try flattening some of the cupping yesterday. Sprayed water on the cupped side, flipped it over and weighed it all down. After an hour it was a lot better. We'll see how much it reverts today.

I ended up ripping the 2x3s in half to do the under frame approach. One more round of planing to make them uniform. They're down to about 1.5"x1" at this point but feel sturdy enough to do the job.