This SF-Fantasy-Fictional addon is building up slowly. If people are interested, I'll upload it to the Motherload when it will be ready. However, all models (about 15 of them, counting some asteroids), are really very high polygonal, so they'll slow down Celestia to a crawl on some systems. Here's the story :
The addon is located in the Zeta Reticuli (1 and 2) systems (I know, I know, there is no real nebula in the Zeta Reticuli systems, but this is just a fictional addon, and the nebula is there for aesthetical purposes only). There's a (fictional) telluric planet in Zeta 1, and another one in the Zeta 2. Both are supporting an advanced civilisation. However, the Cyl civilisation located in the Zeta 1 system are becoming too much populous. Their planet is highly polluted, and the natural ressources are lacking in all their system. So they begin to explore the Zeta 2 system. The fun with the Zeta systems is they are only 0.5 LY away from each other. This gives the possibility to define some highly excentric orbits for ships that can travel to BOTH systems !
For example, here's a Cyl exploration starship. The first picture display it near some Zeta 1 planet. The second picture display the ship between both stars, and you can clearly see Celestia 1.4 at work here ! The third picture below shows the same ship near a Zeta 2 planet, after it traveled 0.5 LY from Zeta 1 to Zeta 2.
But then, the Cyl exploration starship encounter some Zeta2 heavy cruiser :
The tubes on this cruiser aren't necessarily weapons, guns or canons. They may just be some kind of antenas or navigation devices.
More to come.
"Well! I've often seen a cat without a grin", thought Alice; "but a grin without a cat! It's the most curious thing I ever saw in all my life!"