does a component need a size greater then 0 to be hit?

[Suicide Junkie]

Also;
Internals with higher hitpoints are more likely to be hit than a random choice by hitpoints...

IE: one 100kt component and ten 10 kt components on the same ship. The 100kt component has a slightly better than 50% chance of getting hit by the first shot.

For Armor, pieces with fewer hitpoints have a relatively greater chance to be hit.