Many LEGO shipbuilders take inspiration from video games like Halo, and Star Wars. But if you are into spaceships that take their design inspirations from naval vessels, then the upcoming game Fallen Frontier would be a good place to start. Ryan Olsen has found his inspiration for this SHIPtember (a month-long build challenge to create a large spaceship) from the concept art of this real-time strategy game, and it looks stunning.
There are so many great details in this build, like the bank of missile launchers along each side, and the braking engines at the front of the lower rear section. One of my favorite details is the small craft at the rear, with the black and yellow stripes marking the rear cargo door.