I wanted to also build a lot of things to help simulate building the Dyson but can’t think of anything only thing I can think about is a lot of orbital asteroids with habitats that hold billions or million for science and other things
A working and controlled superstructure is out of Aurora model scale, yet you can make a cool ancient superstructure ruin by creating a very narrow superdense asteroid belt (Space master - System view - Add Body - Asteroid - enter your numbers).