An Imperial I-class Star Destroyer, refitted to an Imperial Praetorian-class Star Destroyer, schematic. The Darkest Night is one such example of a refit.
Other schematics include:
Not a precise representation of a Imperial I-class Star Destroyer. This was originally a crossover artwork between Star Wars & Star Trek found on Pinterest (March 10th, 2019) and traced to Etsy under "JOLDesignsShop". With that said, this is the best schematic of a Star Destroyer I have found on the internet.
It should be noted to IGNORE the following aspects of this schematic: