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I don't think it's possible to simulate a perfect recreation of our universe with the possibilities we have in our universe.(approximations, non-computeable...) This means that every level you go down you lose some complexity. If you start out with our universe as base universe you won't get very far until the universes become so simple that they don't support anything life like.
How many particles/information do you need to simulate one particle//piece of information? At least one?