Mini Sub inspired by PC Voxel

Hey guys, I just designed my first Subwoofer based very loosely off of Paul Carmody's Voxel speaker. I am using the Tang Band W5-1138SMF 5-1/4" Paper Cone Subwoofer Speaker paired with a Dayton Audio SA70 70W Subwoofer Plate Amplifier.

The enclosure is has a volume of 12L with a tuning frequency of 34.5hz. This is accomplished with a 1"x 6.4" slot port that is 32" long. All this allows the F3 to 30hz and port air velocity to never exceed 17m/s even at the amplifier's max wattage. I plan to build the enclosure out of 3/4" MDF for the extra rigidity.

My one concern is cone excursion. It will reach its X-max at it's F3 frequency. However I saw that Paul's design does the same and starts reaching Xmax at his F3 of 35hz. Will this be an issue? This is only an issue when running the sub at full amp output though, so I am guessing it should be fine.

I'd love to hear what you guys think before building the box. Tear me apart 🙂