A Super Mario 64 mod may be as close as we ever get to Mario Maker 3D
Engadget -

Super Mario Maker and its sequel are terrific games that let fans create and share their own Mario levels with ease. But it was a bit of a disappointment that Nintendo only factored in the 2D Mario games. None of the plumber's 3D incarnations have made it to a Mario Maker title to date. So thank goodness for modders. A pair of modders named Arthurtilly and Rovertronic have released an open-source Super Mario 64 mod that aims to make it a cinch for players to create and share their own levels....

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