Highly doubt it, the engine looks way too complex for modding, and besides I think they even said before it would be too difficult for the average person to manipulate and make the levels.
Plus, it's a lot of work for them just to make it open ended for people to mod it in the first place, think about the work you'd have to put in for not only making the 3D level architecture, you'd also be working with the camera movement and stuff.
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