Seems right, although my preference for a final mixer tends toward VCA mixers that allow CV control over elements like level, panning, AUXes, etc. Plus, you might consider a stereo balanced output stage to step down your synth level signals to line level and isolate the instrument from potential ground loop issues, etc. Toppobrillo's Stereomix fits into the same 24 hp space, but would allow more sequencer/modulator control of your mix + processing. As for the stereo out, you could easily lose the Links and use inline multiple 'widgets', leaving you 4 hp open for something like a Malekko Output, Happy Nerding Isolator, or Ladik A-540. Everything else, though, seems to be spot-on!