It's really not as stuffed as it looks. Honest.
I set out to just line the walls but there is some polyfil on the big tube in the middle, so that contributes to the "stuffed" look. I used much less fill this time than on the first one (which has already been "de-stuffed"). If I had to guess, I'd say there's about 3 pounds of polyfil in there right now which is around 3 ounces per cubic foot.
No bass traps in the room... yet.
So tired now. I was up until 2 AM working on the dang thing.
Edit: What I'm really curious about is the tune on this second box. Will it be exactly the same as the first one? Higher? Lower? I already have a feeling I will wind up swapping the drivers between the two cabinets (out of paranoia) just to see if that makes any difference in the tune of either. How's THAT for neurotic?