If I'm not mistaken, people who said they don't have any are beeing held for questioning and interrogations, or maybe even denied access. I vaguely remember reading an article about this a while back, so it may not help you as much as you think.
They can (how long can they hold you based on suspicion alone?) and will cause you a lot of trouble if they don't like what you give them.
Couldn't you just tape the music studio triangle sound/echo dampeners (or whatever it's called) around the exterior, and add a floor that has those subwoofer dampening triangle legs (to limit contact with the floor for vibration transference)?