Those ice walls will be included, definitely.
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You guys certainly remember that ugly, flat Onderon Backdrop here:
As you immediately see, its 2D which really breaks the immersion here, and the only way to make it 3D would be to place a real 3D model which probably has the Skybox getting in the way.
The solution?
Goes really quick with VUE, just rendered the scene in 8K and downscaled it to 2K to avoid artifacts when making the background transparent (ignore the Sky for now):
For purists, here a red variant: