This looks great. Two small suggestions: First, I would drop the mult. You don't need it, and you can use a couple of stackcables instead. Second, you probably need a way to get interesting non-fluctuating pitch voltages (apart from the PNW's random voltage). For this, you could add an S&H (e.g., Doepfer A-148 or MI Kinks) or a quantizer (e.g., Doepfer A-156). Alternatively, you could add a Disting Mk 4, and it will do S&H, and quantizer, along with about a hundred other things that you will eventually realize that you need.
Other than that, start with a case that is way bigger than you ever imagine you will ever need. Go slow. Have fun. :)