I remember reading somewhere that the original character models were made as NURBS, which also would not be easy to work with for a game engine. I don’t know how good file compatibility is in the 3D modeling world, but I doubt NURBS files from the 1990s will be easy to open and convert these days, and modern 3D workflows are very different now anyway.
As for the backgrounds, those are actually matte paintings more often than not, sometimes with 3D assets combined but not always. There would be no way to cleanly include those in a modern realtime engine.
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