Has anyone ever conquered a ringworld full of weapon platforms?

[primitive]

You won’t find any suns to blow up in my home cluster. Also got plenty of those orbital spaceyards to get the navy ready.

I have done some tests, and it isn’t really that hard to take out a well defended ringworld. But it will cost way more than it’s worth. It's much more cost effective to just pick off all the smaller planets and just blockade the ringworld(s).

BTW. Does anybody know if there is a limit to the number off troops I can use on a planet to keep the happiness up ?