Thank you for the post folkfreak,
I have the width and length to do room in a room, but height is definitely an issue that may make it impractical. We can rebuild interior walls, but the ceiling and floor are fixed. I am going to have to get an accurate dimension. Even 6" in that dimension is huge one way or the other.
At some level the ASC system is room within a room (the floor especially), but the method doesn't matter, just the results. At least on the walls it would seriously impede the dimensions. I am going to contact them Monday and see if they can put some numbers around db suppression. folkfreak, what is your feeling in terms of suppression?
I may have an idea for the door. I was looking at used/surplus vault doors.