So, I did a bit of digging around in the 510 prototype of Sonic CD, and found 2 additional maps. There's reference to a third one, but the data seems to have been removed (it's just clone of special stage 1's graphics with special stage 3's map).
First, here's a render of the known map (special stage 2 prototype):
Next, here's map #3 (special stage 3 prototype):
And, finally, map #4 (special stage 4 prototype):
And here are some videos of them in-game:
First, here's a render of the known map (special stage 2 prototype):
Next, here's map #3 (special stage 3 prototype):
And, finally, map #4 (special stage 4 prototype):
And here are some videos of them in-game:
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