OK, 60% of you have witnessed a capital ship appearing. Where does one go to do this? Do I just need to spend more time in a combat zone?
Yes - you just have to find the right Empire/Fed combat zone, they seem to be somewhat semi-permanent (i.e. show up in a CZ, wait for a few minutes, capital ship(s) appear(s) -> capital ship will always appear in this CZ).
Checking CGs - yep. From the description, there's another Imp/Fed spat going on at Mu Koji. Should be plenty of opportunities for capship spotting.