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This is pretty simple. It's a piece of 2cm MDF with stiffeners screwed and glued to the underside.
The whole thing is about 6.5' long x 16" wide. It's within about .005" of flat (according to my level) Good enough. I used one of the factory edges of the MDF as a routing guide with a pattern bit to straighten the long stiffener pieces. I cut out the cross pieces on the mill, but the same router technique could have been used there.
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