[Baron Munchausen]

If you want to take the time and effort to create the 3D images, I don't know why you couldn't mod the game to use them.

Building ring and sphere worlds is messy now. You have to make sure everything is out of the way. It won't build if there is anything in the space it will occupy (base, ship, unit, etc.) so one enemy ship or unit can hold up your gigantic construction project.