How big can a knossess be? Violation has to make a limit, for it to be visible at least, it's already huge!! I think a knosses could be humoungousaurusburger if they wanted it to be, it could fit a gigantic jupiter sized warship if they wanted to, but it would take a few more mesons to destroy and be so huge it would be quite tricky to see.
Could thinking though, it is a good idea, there is no cannon i can think of that goes against this, and a node may need the main centre of the warship to travel through the node and the rest could be anywhere. Notice that the collosuss has a larger warp signature than a pegasus stealth fighter? The warp suits the ship! It could be any size!!
Thumbs up for the thought