A note about massive planetary shield modding...

[Sinapus]

...if you mod the the entry in facility.txt and do something like change the ability from "shield generation - planet" to something like "phased shield generation" try to remember to alter the construction_facilities.txt file so that any AIs that do build that shield facility will be able to. http://www.shrapnelgames.com/ubb/images/icons/icon7.gif

[Atrocities]

Ok, but can you provide an example?

[Suicide Junkie]

Wherever you see "planet - shield generation", change it to "Phased Shield Generation". Simple as that.
Look through the AI's facility construction orders.