Being a drawing of a real vessel doesn't hurt, either.
Yeah, but there's nothing wrong with AU vessels either.
catz, in case you didn't get it: sb is MAINLY based on real designs drawings, second on never builds. AU and own designs are allowed and welcome too, that's true. nobody will stop you from drawing AU ships. but expect that real ships are always more appriciated (and they are a good way to learn how real ships work, too)