I finally managed to write some documentation about that freeciv-modpack utility:
http://freeciv.wikia.com/wiki/Creating_freeciv-modpack_content
http://freeciv.wikia.com/wiki/Creating_freeciv-modpack_content
Discussion about Alien World tileset(s) is better suited to freeciv forums at http://forum.freeciv.org. There's two related threads: http://forum.freeciv.org/f/viewtopic.php?f=12&t=31 and http://forum.freeciv.org/f/viewtopic.php?f=12&t=104. I might be back here if we want to use some of your graphics, and need to ask if you are willing to release them under GPLv2+ license.
Civinator, was there an actual Perrry Rhodan scenario for Civ2, and, if so, do you have it? I'd be interested in seeing it.