Thoughts:
Remove the DFAM from the case (mentioned above). Rackspace is expensive AF. Your DFAM is taking up nearly 1/3rd.
Remove the blank panels from your virtual rack. It'll make it easier to figure out how much HP is left in this build for modules.
Passive mults are okay. But they really aren't worth devoting HP space to. They can easily be done in-line. Intellijel has little red passive mult boxes that are dirt cheap. Just keep a couple of those about.
I prefer grouping my "like" modules together: oscillators next to oscillators, envelope generators next to envelope generators, etc. It makes it easier to find things for me.
Things to explore:
I couldn't find a noise source in the rack. Noise (especially white and pink) are great for thickening up sounds, generating random voltages (with help), etc.
Sample and Hold. Look into this. They are often paired up with noise generators.
Quantizers.
Small sequencers. It seems that Yarns is your primary source for pitched CV and gates. A small format sequencer is nice for those times when you don't want to use an external device OR if you're looking for some looping modulation.
Dedicated mixer. I see the Dreadbox VCA/Mixer unit. A small dedicated mixer that can handle audio and DC (control voltage) would give you more flexibility. The Maths can be drafted to do this. But it's a bit of a waste for the Maths.
Small multi-function modules like Ornaments & Crime, Pam's New Workout, Disting EX, Temps Utile, etc. are always great for exploring new functionality and options.
Enjoy yourself.