A Dyson sphere at a distance similar to the one from Earth to Sun needs more matter than the one that can be found in a single solar system. Ringworld had the s

A Dyson sphere at a distance similar to the one from Earth to Sun needs more matter than the one that can be found in a single solar system. Ringworld had the surfaces of several planets flatted out in real scale among all its geography, and it was just a thin strip around the sun. You can go all you want in exponentially build drones, but you'll need matter for the drones too.