Interesting setting, I for one would like to play a nation of merchants and explorers originating from a former paradise dyson-ring that ended up fragmented and partially drifting in their system's asteroid belt, with multiple cultures involved.

I'm a little concerned this setting may be set in a bit too big of a sandbox though. What kind of nation limits are you looking for? Maybe we could all share one system given the sheer size of even a partial dyson sphere?