PowerNaudio
10+ year member
the power of audio
to tell you the truth it look OK, how will it sound theres no telling, they didnt provide any specs on the port. wich are needed to estimate the output potential of your sub in that specific enclosure. your best bet is to have some design you the enclosure. to fit the subwofer need and yours. and there are a couple of enclosure builders out here that will construct the enclosure for you. including my self, joeldirt and a couple more.
if you have any Q? feel free to hit me up on aim=powernaudio
good luck with your enclosure.
laters