Okay, I know very well that this is entirely unrealistic, but this is Blockland. You can make it as goofy as you want it.
What I'm suggesting is a massive armored blimp that you can fly around and use several of the mounted turrets on it. The driver would have the capability to carpet bomb or nuke the ground, while there would be two heavy cannons on it that would be manned by players; One in front, one in back. Other than that, there would be 4 MG turrets, two on each side. Any other players would have mounts in the back, so when they dismount, they can parachute out into enemy territory.
It would have a huge amount of health and would move as slow as forget, but be so massive and well-armed that it wouldn't even matter.
Discuss.