I don't know why the length of SSD is 17000m. Every sources I read says it has 8'000 m. Only Executor-class SSD should have 17000m. There were many SuperStarDestroyers but only a few Executor-class ones. Maybe we can add a new starship class available (still huge one but much cheaper to contruct)?
No. Eclipse and Sovereign were Superlaser equipped (as I remember) ones and are different classes. Most sources says SSD is 8km long, but some says there's another Executor-class which has 17km length...
It's the same ship, just alot of arguement over the length. Part of the problem are conflicting resources even mentioning different lengths for the ISD.