[Trachmyr]

I've never tried it but FYI, the size of ringworlds/sphereworlds is HUGE, the stellar size is listed in planetsize.txt and is unconnected to the size in the description (although MM gave them all the same name (i.e., Huge Planets have Huge Stellar Size)). Tectonic Bombs use Stellar Size not planetsize to determine if their target is valid, they also check to make sure it is a PLANET (not an asteroid/Star/etc.), and Ring/Sphereworlds are PLANETS.... If they check if a world is constructed or not I do not know, so until someone tells me that they tried to use a planet-killer on a ringworld and it failed... I'd say that it remains a possibility.