Adding 8 Inch Woofers to Floor area

Ok,



I have started amassing parts for the off season. I am looking forward to completely gutting my audio system and upgrading.... I have a 2012 MB Sports F21


I was thinking about adding More bass.....I was toying with the idea of adding some JL 8w7 or Sundown Audio SA-8 V2 D.2 Subwoofers in the main area inbetween the seats and floor. I was thinking of glassing a ported box with a single on each side..



So far I have 2 Hertz HX 250s (10s) in a ported enclosure going under the dash.. I want to make sure I have enough bass in the boat...



Let me know what you guys think...Enclosed some pictures of the boat interior..
Has anyone done this before?