Whereas I find the crew numbers a bit on the low side, but then I'm using a different ruler than modern US Navy ships.
Cutter, 25 crew
Bomb-ketch, 30-70 tons, 50 crew
Gun-brig, 100-200 tons, 90 crew
Sloop-of-war, 300-400 tons, 100-125 crew
20-gun frigate (6th Rate), 450 tons, 150 crew
28-gun frigate (6th Rate), 550 tons, 200 crew
32-gun frigate (5th Rate), 700 tons, 200 crew
44-gun frigate (5th Rate), 1500 tons, 300 crew
50-gun ship (4th Rate), 1000 tons, 325 crew
60-gun ship (4th Rate), 1300 tons, 425 crew
64-gun ship-of-the-line (3rd Rate), 1500 tons, 500 crew
74-gun ship-of-the-line (3rd Rate), 1750 tons, 600 crew
90-gun ship-of-the-line (2nd Rate), 2000 tons, 700 crew
100-gun ship-of-the-line (2nd Rate), 2200 tons, 750 crew
110-gun ship-of-the-line (1st Rate), 2500 tons, 850 crew
120-gun ship-of-the-line (1st Rate), 3000 tons, 875 crew
140-gun Santissima Trinidad, 5000 tons, 1050 crew
Though since crewing requirements are irrelevant for anything other than roleplay considerations, I don't suppose it much matters. If Aurora reduces the crew requirements I'll simply multiply the numbers by five or ten in my head and go on enjoying 'The Age of Sail(ing in Space)'.