Germ’s World has a large collection of paper models for wargames in 6mm scale. These would be useful for, say a BattleTech game, or maybe Epic 40k. There are hangars, moon bases, factories, space docks and middle east buildings.
Science Fiction
Basing Starship Models
Star Ranger has this advice for basing your starship models. There are lessons to be learned here for players of Battlefleet Gothic, Full Thrust, Star Fleet battles, and other science fiction miniature wargames.
Paper Models Of Science Fiction MASH Container Units
The TopSolitario website has a paper model of a science fiction Mobile Army Surgical Hospital (MASH) container unit. Its designed for Infinity, but would be useful for any science fiction game.
Outpost Gamma Science Fiction Board Game
Outpost Gamma was one of Dwarfstar Games’ old micro games. It simulates man-to-man combat in a science fiction setting.
Sunder The Stars Starship Combat Rules
Sunder The Stars is a set of free wargames rules for Starship Combat.