There's talk going on of including the Eclipse? Sounds interesting and potentially difficult, you probably want to avoid it ending up with some one-upping game going on: You think a Star Destroyer's big? Look at my Super Star Destroyer! You think that's big? Check out this Eclipse class Super Star Destroyer! You think that's big? Have a look at our Second Death Star!
Perhaps it could be used as the Emperor's transport to the Death Star, have it dock and not mentioned. Or, use it for the Emperor's throne room scenes.