Nichendrix, have you seen the sci-fi content available for MapForge? Between that and the free sci-fi artwork that you can download from sites like rpgmapshare.com, you should be all set to crank out a bunch of great-looking sci-fi maps in very little time. The sci-fi genre has been largely ignored by most other mapping apps, and that's exactly why I made a point of not doing the same with MapForge.