As the movie was filmed in part in the Canary Islands, I wonder if the whale boats were that or Azorean? Both are pretty credible looking little vessels. There's one in the Museum on Nantucket, of that islands origin, that is quite wonderfully outfitted with the plethora of gear they carried. The harpoons were kept in shelter on the ship, as I believe were the tubs of line they were attached to.
A modeler truly interested in whaling would have the opportunity to make something special at say 1" = 1'-0" of a whale boat.
So far the best I've been able to find about the brig in the movie is the term "mock up" which usually means something that might be a steel hulled fishing trawler tarted up. More later.
As for the top ten list of sea faring movies, agreed on all counts so far:
Sand Pebbles (engine was an auxiliary in a Victory ship)
Captains Courageous (the best in every way)
In the Heart of the Sea (have not seen it)
The Bounty (which one), I vote for Laughton)
Master and Commander (weak for me, to much below decks on the wrong type of ship)
Damn the Defiant (have not seen it)
I'd add "The Bridges at Toko Ri"
"Sink The Bismark!"