Reviving the Worst BMW E34 I've Ever Bought After Sitting Idle for a Decade

Today we have a challenge: Can you revive a severely neglected 90s BMW In your backyard with no special tools and no access to spare parts? I have two days in the middle of a midwest winter to get this E34 up and running again using nothing but my knowledge and basic at home resources. The challenger in question: A nightmarish 1990 E34 535i that has been sitting rotting in someone's yard for a decade(or more). This is by far the worst E34 I've laid my eyes on so this should be fun!