What you say is wrong, there is no room for maneuver. You may not bring more than 1500pts to said game and you did so you broke the rules.
Note the Bolded section which permits my proposed deathstar to function
ERRATA
Page 51 – Combat Squads.
Replace with the following wording:
“A ten-man unit with this special rule can break down into two five-man units, called combat squads.
You must decide which units are splitting into combat squads, and which models go into each combat squad, immediately before deployment. A unit split into combat squads therefore is now two separate units for all game purposes including calculating the total number of units in the army, and the number of units you can place in reserve. Then proceed with deployment as normal. Note that two combat squads split from the same unit can embark in the same transport vehicle, providing its transport capacity allows.
Once you have decided whether or not to split a unit into combat squads, it must remain that way for the entire battle. It cannot split up or join back together later on in the battle, nor can you use a redeployment to split up a unit or join it back together.”