That sub has two great qualities to it, it is big and a Nautilus. A great combination, me thinks.
Stacey the year before had a static Nautilus that was 11' long. He downsized to this one, it is 9' I think he said. He may have gotten it from Bob, I am not sure. This time he and I did not get to hang out that much. I will email him and get more info for you.
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.