One could do them as space tiles, for ship deck plans as well you, you just have to give them a more of a Sci-fi feel or look as it would be.
Now the next good idea is to use the 2 wall principle, basically you use a 6x6 inch tile and put two walls up in the outer edge and no two walls will go back to back of each other. The draw back is there no narrow corridors and non stack able. I guess one could make corridors of some sorts if they really feel the need for them maybe to connect to separate sections of a port together but again you have only one level to work with.
So I was looking forward on doing something on the same lines as these for a working spaceport.
Until I found this!
Now this is the best idea that I have seen by far is at Warchest blog http://warchest.co.uk/blog he came up with a great concept by just adding an extra "L" shape wall in the opposite corner make them stack able for multi story buildings, you can see more of his stuff here http://warchest.co.uk/blog/index.php/how-terrain-building-can-spiral-out-of-control/ . You can see just how wild you can go with this total concept.
So here you can see the basic set up
Here you can see the added corners I highlighted, you still have ease of movement with ones fat fingers like mine! You can also see the roof tops in the lower right of this photo.