When the cuts are done, you can check your pieces with a dry fit of the rails and stables. With mounted frame you can get an exact measurement for your center panel. Be sure to adjust your measurement for the grooves in the frame.
With the sharpness in the middle you can mount the cabinet door with glue and clamps. Make sure to only apply glue to the curved ends of the rails so that the center panel hovers in the grooves for future wood movements.
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