After spending a couple of nights in below freezing temps recently, we've found that the aluminum inside walls of a CCD can be a little uncomfortable for a couple of reasons. First, they will sweat directly under the windows where the cold air drops off the window and chills the panel surface. It will sweat enough so that the bedding directly under the window will be damp by morning. We found the same situation will develop under the dinette windows, as well. Secondly, the metal wall in the sleeping area, when you roll over against it at night, is COLD. If you do any amount of cold weather camping, you may want to consider these factors when deciding where to recover the interior with metal.