Dayton DA270 vented box volume

[morris]

With Jeff's Box Modeler I have been trying to determine the smallest box I can use with this woofer for a bookshelf 3-way design. It will be used mainly for music and I trying to get an f3 of around 40 hz. I used the DA270 because I think that larger woofers sound better in the bass department and it should give me the impact that I am looking for. No replacement for displacement they say.

With 50 liters vented with a 3" diameter port tuned at around 23 hz and with 50 watts input the woofer can reach 104 decibels and would be at 6.0 mm xmax. Woofer Xmax according to PE's website is 6.1. Seems like it would work for what I intend to use it for...but what do I know since I am really always be a newbie in this hobby.
What do you guys think of the alignment?

Ps. This woofer cones are SHIINYYYY!!