Hi there! It's me, Maxlion, the creator of Accretion.
This is my first project. I've put a lot of work in it, and here it is!
So, Accretion is pretty big space station(about 68 million blocks if counted with empty space outside and about 14 million blocks if only solid blocks and interior air are counted - It's exact size is 630(l)x630(w)x172(h)). It has full interior, some space ships, nice defences(4 big working TnT cannons) and small town inside with Temple, Nature park, Hospital, Town Hall, 4 resident districts, 2 trade districts, local Amusement park, restaurant, Stadium, Zoo and metro system. Almost everything here was made by me - except 3 spaceships: "USS Defiant", "UNSC Frigate", and "SRN 2900" are made by the guy(or girl) named Atrocities, find him(her) here www.planetminecraft.com/project/atrocity/

It took me about 2 years to complete(I could finish it faster, but sometimes got sick of minecraft and made pauses for a month or two) and I filled this station with a ton of interesting stuff to explore on this map. I hate the idea that you can miss something, so I made a guide around most interesting places for you!. Here we go:

Docking Bay(long wide tube under main disk, with ships sticking to it)
Not that interesting place, and 3 out of 4 passages are closed(i did it cause was too lazy to make interior for ships that are not mine
(as I said, "USS Defiant", "UNSC Frigate", and "SRN 2900" are made by the guy(or girl) named Atrocities, find him(her) here www.planetminecraft.com/project/atrocity/ )
But be sure to come to CSS Astrid(yea, inspired by the one from Ground Control games), big battleship with 1 self reloading Mortar with changeable trajectory of shooting(was made before Redstone update, so the technology of reloading is a bit old and may not work (it actually must work, and it does on my PC, but MCEditor sometimes messes up copying, so something may go wrong and it all can blow up), 1 battery of self reloading cannons(nothing should go wrong, this was made after Redstone update and is pretty simple), 1 Big Front Fireball-shooting cannon(at captain's deck) and full interior of normal battleship (except engine room and whatsoever).

Accretion's Hightown:
Temple(with some nice view from the highest tower), Hospital, Park, Shops(not very different, too lazy to make every shop unique), Bank and Club and 3 Airlocks(if you want to go outside of the station immediately without breaking walls).
Inside Round building in the center there is entrance to Metro System and to Safety Bunker(in case of the station getting sieged).

Town Hall(or Palace). On it's outside teritorry there are Gate Warden's Room, Pig running ground(behind the palace), some Creeper traps, The Secret Entrance to Even More Secret Base under the palace (it's actually a just a well, but you cannot to secret area without putting a Redstone torch onto special Sandstone near the cat).

Town Hall(inside). Everything good palace must have: main hall, guest room, dining room, library and your own private quarters behind the door with codelock (code is 359).
Inside the room you can enter The Secret Area if you put a Redstone Torch on the bookshelf under Trapdoor.
At Secret Area there is Crashtest Room(nothing special, just obsidian box to mess around with explosives), on the left there is Alarm room with tracks to Main Defense Cannons(shoot'n TNT and fireballs), on your right there is passage to Quick Entrance and Exit. But under the bridge right after you come from water elevator lies my Alchemy Laboratory, Enchater's Table, Workplace, Fountain of Wisdom(check this out!), Farmplace(With Cropgrower, Melons-Pumpkin-etc Harvest Machine and Animal Kill Zone(wait for animal to spawn, press "transfer to Kill Zone" and when it is under you
press "Kill" till everything is dead. Enjoy suffering and free reagents) and Secret Infernal room(again, marked by cat and sandstone block).

Resident District. Accesible via Metro, there some fancy living blocks of flats, a Zoo, local restaurant(if you follow instructions you can get decent meal (with a delay about 10-15 seconds... takes time to transfer dishes with water, you know: obsolete technology, I could make it faster, but I wanted to make it simple so that copying with MCEdit won't screw something up and something won't work properly). Also in this District there is Amusement Park with some fun stuff to play with("Chrosses 'n' Rounds", huge redstone machine i made by myself that which should work), "King of the Hill"(or "Zombie-ball": just scratch walking deads with sword you can take from chest and try to kick them to any glowing gate - u'll get golden ingot if you manage to.). Also there is "Arachnophoby"(simple shooting gallery - if targets get too close to you, just close the gate so that they won't escape) and "Ender-race"(race with your friend if you can, must be entertaining).

Well, I guess that's all fun stuff I built in here! Not sure if you read all that wall of words I wrote up here(if you did - well done!).
Again, thanks for your patience, time and interest in my work. There is plenty of empty space inside the station flooded with darkness and zombies- if you have something in mind to fill it - feel free to build anything in here(gotta be interesting, cause i'm now tired and out of ideas) I know that you dont need my permission to change it and share via Internet, i just want you to state who made the original project. And also let me know if there is something not working properly(like cannons exploading, machines not working, etc). Download schematic or world file, click diamond up here, leave your comments and feedback down there and have fun!
That's all, folks! Welcome to Accretion!