You should post a link instead of a picture, easier for us to take a look. It looks like you've thought through it, and clearly have an aesthetic. My two cents are that you will likely need more VCAs to handle envelopes and modulation and you might want to consider some utilities to help you manipulate the system, like switches or routers or matrix mixers, particularly if you'll be playing live. Also, I always recommend utilities like sample and hold, comparators, or random voltage generators for folks, as they are just really fun and damn useful, but it's hard to conceptualize how they can be used until you play with them.
Good luck!