Some years ago I saw a baffle on a 150G or H model made from 1" hard-cell styrofoam that was cut to fit the area behind the seats and placed horizontally, like an extended shelf, running to the back of the luggage area. The styrofoam 'shelf' was covered in upholstery material. Looked good as well as suppressing the squeaking that raw styrofoam makes. Owner said that the installation allowed for full visibility while cutting off the flowthrough of cold air to the rear fuselage.
Also, a cashmere scarf for the back of the neck. Comfortable... and stylish.
