Just thought of a neat game. It's kind of like an old solar-system game I did, except mine wasn't very good. Didn't put much time or effort into it, although it was fun, if you want to render really far off giant objects be sure to center the camera around floating point 0.0000 and put the distant stuff at lower precisions. Also track distances from camera and update far less.
Anyways there aren't many space ship themed 3d games, including ones with small maps. A spacecraft map would consist of asteroids, stars, and planets. Each could be mined or interfaced with with the appropriate tools, and the planets might be kind of abstract. The player mines asteroids and gathers materials from moons/planets to make more fuel, build space stations, missiles, new ships,etc. There could be shooting also. SpaceFlight physics is pretty simple if you assume zero friction, which at "low" speeds is accurate. Steer with the mouse, then thrust to go in the direction, a big part of flying is not hitting the asteroids/etc (braking), so maybe make some reverse thrusters too, or other 'realistic' or other spacecraft controls.
I've been playing a lot of Minecraft of late. One really interesting aspect is the unit by unit creation of whatever structure you can imagine, which I could see possibly doing for asteroids (scupting them into useful forms). To really capture the Minecraft Survival mode feel you might need to blend a little Descent into things, with enemies lurking in the interior of the asteroids themselves. Maybe you leave your ship in an armored space suit to duke it out with rogue robots in semi-mined asteroids.
--------------------Just waiting for the mothership...