The Nordhavn 46 line of boats has crossed many an ocean and several circumnavigations. The Krogen 42 has also crossed oceans. Larger boats the 48s, and 54s, etc all the way up to the 62s of these lines have crossed multiple oceans.
They are still fiberglass boats with single engines (rather low powered) so that they have long ranges. Stabilizers, active or passive are highly useful. Most have watermakers although for an ocean crossing the normal tankage would be sufficient 300 to 600 US gallons.
The Diesel Ducks, Willards and DeFevers all are similarly capable boats although there are not as many of them.
While you certainly can design much more capable boats for ocean crossing than those mentioned you are not talking about a production boat but a one-off.
Clearly a steel hull would reduce the damage if you hit a submerged object at sea, but what is the real likelihood of that happening. Many of the other improvements we can name also have just a small increase in safety.
Anyway, the Nordhavn 46 has reigned as the ocean crosser since it was first produced. In part because the newer boats, the Nordhavn 47, etc have not sold in the same numbers.
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Marty
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