Rebalancing Factions Such as liberty

I want to have high level ships (With the original Ships but edit them for higer level power and weapons) and missions available on the ojb board because liberty is supposed to be the big system so if a player wants to play open single player or has finished the game they can use a mod like this. I have done this partilly by making misiions where you have to talk to a person to get them with high levels but now sure how to do the other things