Printer Enclosure Material Selection
To reduce the noise, you could replace the metal linear bearings for plastic ones. This reduces the produced noise considerably from experience. Also, put the printer on damping rubber feet.

Enclosing the printer should be done with care, completely boxing the printer up could lead to increased temperatures of your board electronics, steppers and cold end cooling. Make sure to vent some air. How you box up does not matter, although double glass window panes does seem a bit of an expensive solution.