Re: wall sized TV, on a sailboat
My only recommendation; try to avoid cutting into the bulkhead with this kind of job. Mounting a TV on the bulkhead is fine, mounting one in the bulkhead not so much.
I've seen a lot of boats where tvs are recessed into bulkheads, making reversal of the modification difficult.
This is probably less relevant these days because new LEDs are so skinny anyway, recessing one into a bulkhead would make little difference.