Another member on the group recently had a bad experience w/ salt mist and his motherboard. It might have been because of an immersion (though he sez no) or the 'helpful' cleaning it got later on, but contamination in any environment is a potential hazard, and it's worth planning for, especially in as dynamic an environment as a boat.
Will the 37" display be the monitor? Does it need A/C, or can it be run without the inverter? Seems like that's a big potential source of efficiency gain.