Yep, that's the problem with these ideas about terraforming. If you have the technology and energy to change the environment on a planet that much, it's really easier to just build O'Neill cylinders or some other large stations and rotate them so that you get perfect 1g gravity, and you can stick them in whatever orbit you want (i.e., close to Earth) so that they aren't far away and they're at just the right distance from the Sun so that they aren't too hot or cold.