STL, origami, or CAD
I made STL files if you want them. ShapeWays wants $245 for the bezel and $62 for the knob portion only. I didn't have them made.
What about using styrofoam or wood or poster-board and fabricate with ref to views in the installation manual section 4?
I came up with a blind area using SolidWorks... images below. I'm showing a 1/2" dimension for the blind area and if you made it 3/4" it would be quite conservative IMO.
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