That is an awesome idea. Level builders have always been a great addition to any other game; I don't see why no-one's thought of it before for Zelda.
If there was some way to create your own bosses...now that would be cool. There could be basic 3D characters that you can stretch to adjust the shape, and then add weapons and textures to it. Or is that too unrealistic...

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Careful with that Axe, Eugene