This is the bow of the Charles Cooper, launched 1856 and the last remaining packet ship that carried emigrants from Europe to the USofA. It was rescued from the harbour by the museum and awaits its fate in an amazing scrapyard I found, containing many many tons of ships timbers, an Argentine armoured car, a British fire engine at least one windlass and a whale's skull.
here's a section through the hull where the bow was cut off - that nail can't have done the chainsaw any good! Outer planking is about 4", nails about 1" diameter and up to 30" long in some uses.
This is a close up of the external end of the trenails fixing the planking. They were split vertically with a dark wood wedge driven into the end. There are also random iron nails, which I assume are repairs.
Here's what killed many hulls - the boring wormholes. This piece of timber is about 6" high, you can fit a finger down the holes - it's obvious why they wrecked the structural integrity of the ships.
Here's a pile of yard arms, you can see the octagonal centre sections, they are about 18" diameter.