In game, you'd never be able to refit the Galactica or the Basestar. They're too big, for example, on the Galactica,
http://puu.sh/wV8j Only weapons mounted there, in the midsection, would you be able to refit. You can't scroll the ship, and as far as I know, you can't zoom out while refitting, so guns and missiles mounted to the fore and aft would be untouchable. Same with the Basestar, although, doesn't the Basestar keep most of it's weapons in that central section where the ship rotates?