Ruhk: Yes, actually. The cargo bay doors of the Exodus-Class Heavy Courier can line up with the station's hangar bay or any of the docking arms coming off the long edges of the posters.
The Celestial Warrior: Thanks!
If you rotate the upper-right and lower-left maps and put them in each others' place, for example, the walls and floors will line up seamlessly.
Also: If you take a map and rotate it 90 degrees, laying it over top of its neighbor, in most cases it will make an L-shaped map with map features lining up with one another. The hangar confuses that system a bit, but generally it will work.
The bottom-right map is huge-friendly where the other three are not. I'm hoping it will be deemed acceptable for tournament play, but that will be up to the powers that be. Each of the maps by itself is decidedly asymmetrical with limited access points, so balance is tricky. But take the four in combination and you should be able to set up a very balanced 4-player battle royal.
Yes, they will have the customary terrain lines.
Wannabemexican: You are correct about how the ship fits together. That asymmetrical piece, though, is a detachable shuttlecraft. If everything goes as planned, the posters will include two 5x7 terrain cards that fit together to make a second shuttle, which can then be placed on the other side to balance it out.
Incidentally, the larger ship itself is actually detachable as well, along the line between posters. I did that so people who have only the bottom two maps, or the top two maps, can still form complete starships. When the four maps are placed together with the ship in the middle, though, they form one large passenger liner with a landing shuttle docked on the front.