Roughly the same process that opens the models can be used to open the levels as the levels are .mtf files, the file type used for the game's inanimate objects. Should they become able to be extracted, though, they'd have to be untextured; if they're anything like the character models, only one texture can be viewed on the model at a time, and it would be way too complicated to try to Photoshop the textures of an entire level together in a way that would look nice.
The strategy guide had top-down views of the levels, so those might work for you if you can live with the scribbles that Prima put over top of them.
