Hull size, hull points, and internal space

First question: when designing a civilian ship, how do you determine its hull points?<div><br /></div><div>Second question: when adding weapons or defenses to a civilian ship, you do a calculation (Limits, <i>Knight Hawks Campaign Book,</i> p. 19) to determine the effective internal hull size of the ship not taken up by the weapons or defenses. For instance, if you put a laser battery and a reflective hull on a hull size 3 ship, it is internally equal to a hull size 1 ship. So does that mean that you should look at the Hull Specification Chart (p. 11) to see how much internal space you build your deck plans on? That hull size 3 ship would have only 10m × 2m (diam.) of living space, not counting miscellaneous equipment?</div><div><br /></div><div>Bonus Question: when designing a civilian ship, how do you determine its damage control rating?</div>