This is my take on the Imperial-class Star Destroyer, as seen in the following: A New Hope, The Empire Strikes Back, Return of the Jedi, The Force Awakens, Rogue One. Here's a short bit about them. In the Sith Wars, the Sith utilized large craft in attacking the Jedi. Those were transformed into the Acclamator and Venator class Star Cruisers that you see in Attack of the Clones and Revenge of the Sith. The Jedi Attack Cruiser (Venator class) evolved into the even larger Imperial Star Destroyers, that could obliterate planets. Those brought on a new era of ships dominated by one even larger destroyer: the Resurgence-class Destroyer. This ship was twice as large as the Imperial class. However, I did neglect to tell you that one ship ruled them all, and would until the end of the galaxy: The Super Star Destroyer. This ship dominated the history of star cruisers and destroyers. It was at least 10 times as large as a Imperial-class. In the movies, you only ever see two such destroyers: The Executor and the Ravager. The Executor was Darth Vader's personal destroyer and was destroyed by A-wing fighters at the battle of Endor, and the Ravager, which was disabled and downed at the battle of Jakku.
The ship I made has the exact same body that my knex version of the Finalizer (Resurgence-class) utilizes.