I don't know about the vehicles flying overhead, but something more like Helicopter crash sites would be fine I think. Bases would just be relatively the same concept, just a different "skin." The idea I really like is the zombie military island. Perhaps instead of just offering "high-end" military loot for your character, it had valuable resources for building armored cars, base building materials and other fortifications (machine guns, anti air defenses or whatever) as well. That way you would have to start slow by dragging one piece at a time back to your base and slowly building your stash and collection to the point where you can take a ferry and a car to load up with more loot, thus making it more efficient to raid for loot. It would still make base building possible without going to this island, but you'd find much better quality and better security measures for your base. In this way, you can also have a status symbol if your collection, base, car and gear is so insane that people will know that you have run the gauntlet many times. Does anyone know if they kept building destruction in?