Imperial II-class Star Destroyer

The Imperial II-class Star Destroyer is an update over the iconic ISD I. Here is its Wookiepedia entry. 

This vessel basically had heavier weapons, and would have been meant to phase out the older models over time.

  
Role: Destroyer, command ship, starfighter carrier
Size: 1600 metres
Speed: 60 MGLT
Shielding: Unknown
 Main Battery: 6 Octuple Heavy Turbolasers, 2 Octuple Heavy Ion Cannons
Secondary Weapons: 50 Heavy Turbolaser Batteries, 20 Heavy Ion Canons, 10 Tractor Beam Projectors
Anti-Fighter Weapons: None
Complement: 1 Wing of TIE Fighters, 5 Assault Gunboats, 2 GAT-12 Skipray Blastboats
Availability: Tech Level 2 (After the Battle of Yavin)

Tech Levels 0-2 Starfighters

TIE/LN Starfighters (5 Squadrons)
TIE/SA Bombers (1 Squadron)

Tech Level 3 Starfighters

TIE/IN Interceptor (1 Squadron)
TIE/LN Starfighters (4 Sqadrons)
TIE/SA Bombers (1 Squadron)
Assault Gunboats (2)

Tech Level 4 Starfighters


TIE/IN Interceptor (2 Squadrons)
TIE/LN Starfighters (3 Sqadrons)
TIE/SA Bombers (1 Squadron)
Assault Gunboats (5)
Skipray Blastboats (2)


Tech Level 5 Starfighters

TIE/IN Interceptor (3 Squadrons, Refit Version)
TIE/LN Starfighters (2 Sqadrons)
TIE/SA Bombers (1 Squadron)
Assault Gunboats (5)
Skipray Blastboats (2)

Star Forge Variant Starfighters

TIE/D Defenders (3 Squadrons of 4)

TIE/AD Avenger (2 Squadrons)
TIE/IN Interceptor (2 Squadrons, Refit Version with Shields)
Scimitar Assault Bombers (1 Squadron)
Assault Gunboats (5)
Skipray Blastboats (2)

I am currently using a model from the original game (not the same as the ISD model) for testing purposes, if you have a more appropriate model please let me know.