DaveTheMagicWeasel
First Post
One thing no-ones mentioned is Dragonstar. I was a player in a game for the last year and it was quite enjoyable. Some of it doesn't fit in with the guidelines in the OP, but there's a fair amount of stuff to pick and choose from.
The vehicle rules are reasonably well done - in that they are simple enough to understand. The main problem we had was how to keep track of 3d combat on a 2d map, but thats going to be the case for most systems.
There's also quite a lot of supplemental material created by 'Neo' for free here (you'll need to scroll down).
In particular, the spaceship construction rules and the computer rules are worth looking at, and might well be what you're looking for.
The vehicle rules are reasonably well done - in that they are simple enough to understand. The main problem we had was how to keep track of 3d combat on a 2d map, but thats going to be the case for most systems.
There's also quite a lot of supplemental material created by 'Neo' for free here (you'll need to scroll down).
In particular, the spaceship construction rules and the computer rules are worth looking at, and might well be what you're looking for.