A modder named JJxORACLE decided to replace the existing boring Blimp model in Grand Theft Auto V with the giant Reaper from Mass Effect 3.
In combination with the Ped Riot / Chaos Mod this will be the perfect apocalypse scenario for you. Here is a short video that demonstrate the cool Reaper Model from Mass Effect 3:
Changes in version 1.01:
Deleted unnecessary polys
Moved the Blimp shell closer to the front for a better view for navigation
Sometimes it will disappear
There exists no collision model, that means you can fly through the Reaper
Legs touch the ground while in transit.