Box looks great... kinda like mine.

Except mine's sealed and I was putting it together so fast that it ended up as a downfire. LOL.
I was surprised to see your port that way too. But if it sounds good, you did something right. Most ports i've seen tend to have a channel/wall. Here's what I would have done... don't know if it's right but I think it'll be cool for the rear passanger to get air blown at their feet.