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I remember dicking around with a .big file editor a few years ago, I added ion cannons to all my Scouts and Interceptors. Then I went and changed all the cannons on my Assault Frigate to Ion Cannons and, then I decided to add nothing but ion cannons to all of my fleet's ships including my mothership.
Yeah, be sure to not get carried away when you edit the .big files you may just do something so awesome that the world may blow up.