A bit late to the discussion here, but clarification of crits for large ships would definitely be appreciated. Of course, depending on the rule changes, the current issue may not be relevant, but at this point, it seems to me that the "Critical Hits on Large Ships" rules are vague enough to lead to confusion.
How I would interpret the rules is that you use them for ships with more than 1,000 hull points, based on "Severity of a critical hit is based on 1% increments of the ship's hull value (minimum 10 points of damage)." I would also say that the 1% figure is the minimum damage that must be inflicted for a critical hit. In which case, it is
to crit a ship of greater than ~28,000 tons (standard hull, no reinforced or light hull), as that would have 14,000 hull points and the large fusion bay can only do 140 points of damage on a max damage roll. But if only 10 points of damage are necessary for a severity 1 crit, then installing large numbers of large bays allows you to go fishing for criticals with that nice +4 bonus. I'm just not sure what was
with these rules, so it's difficult to know which interpretation is correct.