What are you sequencing with? Is "Rings into Clouds" the voice you want to focus on (nothing wrong with it - just checking), or are you planning on running external audio through this or adding a more traditional oscillator? If the two are being considered the main sound source here, why Rings but not Elements or Plaits? What do you imagine doing with this, exactly?
It's not that I want to question your motives or suggest these are a bad start. I don't necessarily think you need to make a standard subtractive voice. This is one of those setups where you could get very good and usable stuff out of it. That setup could also be frustrating depending on what you expect. We need more info before making any suggestions.
That being said, I think an envelope generator (preferably with multiple envelopes, like a Maths or a Doepfer A-143-1) and a filter are sorely missing here. The former most of all. Also, I wouldn't spend any more real estate on effects even if you are going with a Mantis case. Those are things I can say pretty confidently now.