truck subwoofer ported box design

I want to build a ported truck box for a Re Se 10". Website recommends 1.25^3 Ft. at 34 Hz. I designed a box of 1.35^3 ft. at 34 Hz. But after Sub Displacement is subtracted it comes down to 1.20^3 Ft. I want to know if this is a good design and if calculations are right?? Please help me as soon as possible. I have very liitle space. (On the images I put "Sq. Ft." instead of "^3 Ft.". Sorry.)

1/2 inch, 5/8 inch or 3/4 inch material?

3/4

why not just add a little to a side measurement and bump the size a little....also why tuning for 34hz? why not up higher about 45 or 45hz where so much of the music bass is focused at?Matt