The Craftworld assault scenario has the surface of a Craftworld as one of the board edges. They're flipping huge, somewhere between a small and a large planet template.
I suppose, if you were to have one to scale and not be using the "low orbit" rules that the official scenario used, then it would probably be a planet shaped like a ship. Roughly 8" long and maybe 4" wide. It would have a gravity well like a large planet and could shoot some weapons from specific points.
The largest BFG model made is definitely the Planet Killer. But model size has no interaction with the rules, all measurements are made to the stem of the flight base.
The largest model with rules would be the Space Hulk, but you have to make your own.
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