So I used ikediger's Mandator-IV design from KDYards to build a 400pt fleet- maybe not realistic? Maybe it would need more points? Interested to see your thoughts.
Mandator-IV Siege Dreadnought 275 (http://kdyards.com/ships.view.php?id=4521 and http://kdyards.com/ships.view.php?id=4520)
Grand Admiral Thrawn 32
Heavy Auto-Cannons 20 (http://kdyards.com/upgrades.view.php?id=4522)
Gunnery Teams 7
Reinforced Blast Doors 5
Leading Shots 4
Agent Kallus 3
Ship Total: 346
+6 TIE Fighters 48
Fleet total: 394