In the image you can see the IR-LED fits snugly and the housing is supporting the LED.
Only thing left to do is clear out small splinters in the holes and paint the baffles. I will paint the side facing the acrylic white and the other sides black. By painting the front white (along with the holes) I will reflect more light into the acrylic. By painting the other sides black the paint will absorb the escaping energy and hopefully reduce any false readings due to light leakage.

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