Very nice but you may want to consider a few things, Or not..... Those kicker amps are gonna die from corrosion related to the batteries off gassing. Not to mention spark hazard. The batteries also need to be secured in acid proof trays. Using boxes might be the easiest way out of both issues. Use hex nuts in lieu of the wing nuts. A good start to be sure, nice boat. It always seems to take so much more time then when you first imagined the project. You sure didnt skimp on product choice.
How many trips to the hardware store did you make this weekend?
Please post more pics when finished.