Help with Dual MCM 8" (55-2421) T-TQWP

I have four of these subs and want a little project. I like the idea of a small footprint but tall sub. Will build two. Each has two 8's. I'm at about 10.5" x 13" x 5' tall. Here are some screen shots of Hornresp. Hoping some of you could double check things... Thanks!!
 

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