I don't think on this forum there is anyone with the knowledge and experience to help you.
This is a really tough project. Audio I think I could do, but an AV system above two 800 HP diesels in a 65' boat on the Pacific ocean is something that may not even be possible.
Domestic equipment is not really practical. It needs to be designed for a harsh marine environment or you will waste your money.
First off you are not on the grid. You will have a generator with output, waveform and smoothing that is not known to us, and would have to be tested and analysed.
The marine environment is harsh with the salt water air. Then an even bigger problem is vibration of the engines and the pounding of the sea. A 65' boat powered by 1600 HP in the Pacific ocean is going the give the gear a pounding to put is mildly. Domestic equipment will not last five minutes, but blow up fast.
So you are going to need equipment that is built from aircraft grade components at least.
I have done a search on the question you pose, and this type of equipment is around to an extent.
I have to tell you that you absolutely need the help of a specialist marine integrator for what you are planning.
It seems you are on the West Coast at least within sea range of Seattle. The only outfit that I can find that might take on your project is
Definitive.
I have looked at others, there is a large outfit in the UK that will go anywhere in the world but I suspect for a very high price.
One thing that I have noticed is that these outfits do not have projects in boats as small as yours. Their work is in boats largely in the 120 to 150 ft class.
Unfortunately this may well be for practical reasons.
So you need professional advice first to see if your project as described is even practical and feasible.
I would get in touch with Definitive. Any advice any of us here would give, would be worthless.