I had just read a Harry Turtledove book called,A World of Difference. In it, the author simply replaces Mars in our solar system with Minerva, an earth-like world. I used this same idea to place our world’s continents into one section of a ring world. Then I set it in 1913, which let me put Teddy Roosevelt in the story.
There were a lot of starts and stops before I finally finished this book, but eventually I did.