[Val]

Sounds good to me, and I think people that have played similar games should have no trouble with that idea - it's the same way you won't get your carriers until you research fighters, to someone who has researched the entire ship con branch and then researches fighters level 1 and then they get carriers might make them think that is all they need (as in your example).

Anyway, I am doing a similar thing for the weapons in the B5 Mod with letting people research the specific weapon tech fields (Plasma Weapons) and then general fields (Light, Medium, Rapid Fire, Point-Defense, Accelerated) in some cases a really complex device may require the research of several fields to even get access to the correct techs before researching the weapon.