That has got to be the cleanest Dynamatting job on a lid evar. Are you planning on covering the dynamat with something else? maybe a cute lil STI trunk cover?
It never amazes me how much work people go through to stop other people from hearing their trunk rattle.

I'm taking a lsightly different path - I faced the sub into the vehicle and faced the three ports upwards with a false wall sealing off the rear from the front - 0 rattle and a lot louder bass.