And to think, I have some clown giving me flack in another thread for questioning pet store owners who have no clue what they are doing. You aren't considering just buying a tortoise, from what you have said it sounds like you will be rescuing one. After browsing the care sheet, consider using rolled wire mesh for the bottom of your outdoor enclosure and cover with say 6 inches of dirt or organic soil. They can dig and escape almost anything, so that will let her dig but only so far and prevent escape. For the walls, measure her and go no less than twice her length in wall height. Be wary of predators and devise a top...that mesh works well for that too.
I have nothing but respect for people who rescue a tort from bad conditions, keep us posted.
In the other thread you were giving a pet store worker a hard time for coming to this site to ask questions.
That clown was tell you to wise up and welcome pet store workers to the forum rather than insult them.