RE: Death Star. Since it is the second Death Star, which never went out of orbit of Endor due to the deflector shield projected from Endor's surface, I'll allow it. But for the record, this does not mean that starships under construction, like the Abramsprise being build on earth from STAR TREK '09, have any chance of being allowed. This goes only to this one particular case, and od0_ital made the argument based on the deflector shield, and this was what made my decision.
Anyway, I think there're still a few possible entries. Planetary buildings are a bit underrepresented right now.