I have a wooden shed that is 12ft by 14ft and about to install the home theatre equipment. I am planning the lining stage, its 3inch thick, and intend to use rockwool and heavy roofing felt to cut down on sound leakage, its also 200ft away from the neighbours? I could then dryline for a smooth finish or clad vertically with tounge and groove period style pine cladding? My idea that the undulations should make an acoustically good interior, and cut out any sound reflections? any thoughts??