Re: SE5 - Mod Out LCX as Early Warship
 

It is looking at type of the ability, I surmise. Witness:

Requirement 7 Formula := Get_Design_Ability_Percentage_Of_Hull_Space("Units - Launch", "Fighter") >= 50

This is looking for the Units - Launch ability, of type Fighter.

Looking at fighter bay:

Ability 1 Type := Units - Launch
Ability 1 Amount 1 Formula := "Fighter"

The second parameter of the req formula matches the ability amount 1 value. Maybe 1 just means "true," to match anything with the ability?