I plan to use commercial grade, closed cell foam floor matting on the floor of the entire interior. It came out of my martial arts school. Each piece is 40" square. It should provide insulation, padding and sound deadening, I just don't know to what extent. If I don't like the look, blue, I may look into some kind of natural fiber rug, jute or sisal, to throw down on it. Given my situation this seems like the best approach with the triple whammy, fast, cheap and easy.
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