Conversed: "When you read the book, did you notice they wrote the USS Really Big to be over a kilometer long?"
Implied: The actual length of the USS Really Big is never stated, but a fan works out its length by scaling its on-screen model against objects of known length.
Deconstructed: The USS Really Big is Awesome but Impractical, costing so much to operate that it bankrupts the country that built it and gets blown up by a much smaller ship taking advantage of its poor maneuvering and acceleration.
Reconstructed: The USS Really Big despite its flaws has some major advantages. It is capable of transporting cargo with unprecedented efficiency per weight when fully loaded and covers the budget issues quickly with a few majorly profitable shipments. It is capable of holding smaller craft for its defense as well.
Played For Laughs: It is implied that the ship was made so large because its funders and designers were Compensating for Something.