[ Giving Hank a project, something to focus on, is smart. Because otherwise he would be worrying about their current circumstances or thinking about how angry he ought to be with Erik for Paris.

He scratches the side of his nose, frowning as he works out some mental calculations. ]

For the purposes of a three-D model, it's probably sufficient just to have one Earth, perhaps with an expandable database of the different variations therein that you could open up if you cared to explore further.