Howdy all,

 

CT Book 2 Starships p. 21 "Finally a leeway of plus or minus 10% to 20% should be allowed. If the final deck plans come within 20% of the tonnage of the ship specifications, then they should be considered acceptable."

 

IIRC the hull is 2,000 tons deck plans adding to 2,400 tons is acceptable. Current deck plans 3,000 tons contact Grandfather and barrow a device that negates 600 to 1,000 tons.