My custom Star Destroyer I made to compliment my mini ISS (in the photo for scale). It was designed as a prototype during the Clone Wars to destroy space stations, and counter ships like the Malevolence, if more appeared. It is about four miles long. Each bow houses a low-power superlaser for cruiser destruction. Between the bows are tractor beams, turbolasers, and hangars. (The whole design is a bit corny.) This model is 15 inches long. I made it in about 3 hours. Enjoy and please comment!
About this creation
The back is the vulnerable part. There are few cannons and shields back there. This exposed area also houses the hyperdrive and the engines. A strong enough blow to that part of the ship will spell its doom. The engines also do not provide sufficient power for the ship to chase smaller cruisers.
A small city-scape up top houses multiple secondary bridges, sensors, and shield generators. The main bridge is quite large and flat.
Typically the ship traveled with escorts compromising of a few Star Destroyers. Normally these ships would race ahead and clear any small opposition, such as starfighters and gunships, leaving the Devastator to take care of any larger ships and capture any important ones.
The deep belly houses a powerful reactor, but nonetheless the ship is underpowered. The reactor cannot power both the weapon's systems and engines to a satisfying capacity at the same time, making the ship slow. It also cannot recharge its superlasers fast enough (which is why it was fitted with two), leaving it somewhat vulnerable to attack.
The Devastator excels at broadsides, and its powerful tractor beams and weapons can subdue almost any ship it meets in battle. Unfortunately, it was too slow (it went about as fast as the Death Star did) and bulky to be an effective weapon. Although one of the most powerful weapons of the Clone Wars, it was soon deemed obsolete as the Empire developed better superweapons, such as the Death Star (which outdid it in the destroying role) and the Executor (which outdid it in the tactical and offensive roles). One of the three ships built was scrapped, while another was destroyed during the Battle of Endor. The last, and original, ship was captured by the New Republic, stripped of its armament, and was turned into a bulk carrier. With the absence of its weapons, it was much faster. It was later sold to a freight company, and was used during the Evacuation of Dac.