HI MacCollac,
I know this is only 5 years after you posted this question, but I just now saw this when I was looking for something else.
To answer your question (five years later) Yes I have used Sails of Glory terrain with Black Seas and it scales well, even if in a forced perspective type of thing.
I’ve used the Coastal Batteries as well as the shores and shoals etc from Sails of Glory.
And our group is even considering using the Sails of Glory ships with the Black Seas rules.
I attached a picture of one of our games where I used the Sails of glory terrain which included the gun batteries.
This reply was modified 1 month, 4 weeks ago by Daniel Morgan. Reason: added more text