The shade fighters are mass produced in the Earth Alliance Federation (my fleet of ships to minifig scale). They are produced like this because of their excellent firepower and speed. They boast two sonic proton cannons and a cloaking device which renders the ship invisible to all but the most inquisitive eyes. The reason being is once cloaked, there is a bluish sheen to the ship and this is a problem that cannot be overcome at the moment.
Size comparison with the Britannic Darkstar. Oh yeah, i forget to say that the Britannic Darkstar is approx. 54 studs long.