Added insulation, like the guys put inside thier car doors-panels might be an idea? Something that would be asily cuttable with a utility shears, and peel, and stick would be the way to go. Provided you're not covering the very small slotted vents on the bottom, this shouldn't make the machine run any hotter than it already does.
I will note that when I added a cooling fan to my 16.5, that sound levels did slightly increase, due to adding another hole to machine. Mark
I will note that when I added a cooling fan to my 16.5, that sound levels did slightly increase, due to adding another hole to machine. Mark