A long time later... Update No.3: This mod never went SMP. I'm just going to leave this here, though.

Update2: Spawn is screwed. Cannot fix. BUT if you have a server you can just set the spawn in the center after walking to the, well, center.

Update: Someone just told me there is also a random hole in spawn. Will fix soon.
SPAWN IS SORT OF FIXED. WORKING ON THE PROBLEM. JUST WALK TOWARDS THE DOOR AND USE THE BUTTON TO GET TO SPAWN.

(Update 5) Small details added. Map complete. More pictures!

(Update 4) Adern Terrain complete. Spaceship docks for Adern complete. Adern Fighters and Frigates complete. Map nearly finished.

(Update 3) Sleeping Quarters for Atori Added. Suns for both planets added. Adern Terrain nearly complete.

(Update 2)Time-space holes and Secret added. Moved to Overworld, walled in, and added beds for spawn changing. Opposing sides will have chain and mail armor. Working on claimed spawn system.

(Update 1)I'm working on making a CTF map for the zeppelins mod, which apparently will go SMP soon. So I decided to make a CTF map in the end with spacecraft battles. Have some photos. Anyone have any suggestions? I'll update with rules, regulations, and random stuff when I think of it. All ships will shoot fire charges, which if applied properly CAN take out an average airship.

...And even though the game is focused on the defense of Adern, I did Atori first, because I got to do fire.

Note: The finished version of this map will require the zeppelin mod by blakmajik, which can be found here.
www.minecraftforum.net/topic/488434-125-zeppelin-031-wip/
It's a really fun mod and I suggest playing with it for a while.