Correction: here it is again. Just the upper box needs to be modified.

box   // Canvas
{
  < -10.0, -1.0, 0.0 > < 10.0, 1.0, 0.005 >
  ...
}

box   // Wooden Frame
{
  < -10.0, -0.025, 0.005 > < 10.0, 0.025, 0.055 >
 pigment {  Brown }
}

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