Recently LEGO announced the upcoming Home One set. "Pshaw!" cries FoxHound, and unveils his own Mon Calamari Star Cruiser. This looks to be in scale with the ISD set. In some ways it's best to look at it without the nice black background and see in in the context of a living room - generally not the best way to display a MOC, but you can certainly appreciate the size of this creation.
Edit - I stand corrected. This is not actually at the same scale as the ISD set, but at a larger scale. Thanks, RH.