[Ragnarok-X]

Of course you add more than one of each Version, but it wont help you in combat modifers. It just gives you more safety since on component can be destroyed and still have the modifer. It doesnt make sense though, since those components are quite expensive. If you want to design a good ship, add one each of basic and advanced sensors / ecm. Dont try the elite Versions, they offer to few benefit while costing too much. Of course if you have time and ressources to spare, add them, too.

Just on a note, today i finished with the basic facilites. I will post the datafiles later, dont expect to much, its only one level of each facility and they dont have tech prerequisites yet.