(I am german, so accept little spelling- and grammarmistakes)
My Starviper was created by a boilerplate (no instroduction). But this one is a just devised one. As first I didn't want to make a New Republik Battleship but a anything other. As it was finnished, it looks like a of rebels captured and modified Stardestroyer. But a really heavy modified Stardestroyer. So, I was thinking maybe it's a Battleship from the New-Republic.