A melon shark with three unicorns got a state contract to construct a railgun platform into an asteroid with thrusters allowing it to move. Along with basic crew accomodations. This would serve as a powerful very long ranged weapon against space stations. With uranium slugs being fed from a tight storage area bellow the actual railgun, like a conventional magazine. With a big hammer device at the back of the railgun triggering a small explosion, propeling the projectile forward enough for the magnetic rails to push the projectile forward at very high destructive speed. However it can't move fast enough to travel from planet to planet; It actually can't move much at all due to high mass compared to the power of it's thrusters.

The construction was abandoned earlier then expected due to resource shortfall and the melon shark transfur leading the worker's, ending up disabled due to brain damage from a headshot.