I've been watching a lot of Isaac Arthur's videos recently, and the man is absolutely obsessed with mega structures. O'neil cylinders, Launch Loops, Orbital Rings, Orbital Mirrors, the list goes on and on, and I wondered, what would it take to build these kinds of structures in KSP? Using both Extraplanetary Launchpads and USI Kolinization, there's practically no limit to the sort of stuff you can build, since you're not limited to having to launch stuff into orbit. However, constructing things