Enclosure help

[g8m3rtag 0]

I'm thinking of going with a 15" Q for these, powered by a Sundown SAZ-1000D

So I've been messing with the RE calculator and think I have come up with a couple of designs. I just want to make sure all the numbers are right on these and see some opinions on which one is better. I like the first one more, sub up port back, does that design output well? How do you make the horizontal and vertical 45's come together smoothly? Also, would the first box fit a 15" BL? I know the second one doesn't have the airspace for a BL which is another reason I like the first one. In case by the time I order I decide to go with a BL (I'm very indecisive)