> In contrast, Macross is very unrealistic because Macross is equal to a pile of 182 Nimitz class aircraft carriers in terms of mass.

Is it? It's also 5 times longer (and presumably wider) than the Nimitz aircraft carrier. That would mean that Macross is only about 5-6x denser than the Nimitz aircraft carrier, which isn't entirely out of the realm of reason for a futuristic space battleship. If nothing else, having several tens of meters of dense matter between the innards and the outside where high energy photons are flying around sounds like a great idea.

It was also originally meant to house creatures much larger than humans, which correspondent mass, so the structure of the ship would reflect that.