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Great info. With 2020 being what it is, it's definitely a good time to get back into making some music. I love Amon Tobin and Fever Ray.
Well, let's think about your proposed rack. You have a few different sequencers (Mimetic, Steppy, Euclidean), all with different strengths, weaknesses, and learning curves. Have you considered combining these into a single, more powerful, full-featured sequencer? I would recommend a master clock like Pamela's New Workout for sure (It can do gate sequencing, Euclidean rhythm stuff, LFOs, etc. with 8 outputs, 12 if you get the expander). The sequencer itself is a matter of taste, but I would try to whittle it down to one good one that can do multiple channels of gate and CV.
Again, a matter of taste but, I feel like there are better options for drums beside the Queen of Pentacles. It's getting very mixed reviews, and for that kind of money I think I would choose an outboard option like the Roland TR8s, TR6s, or something similar. You would have access to every great drum machine sound of the past, sample playback, fun and intuitive sequencing, and some effects. I think the TR8s also functions as a USB interface as well, but you may want to check on that. I have Endorphin.es prior drum machine (Blck Noir), and it's a love/hate thing. I rarely get exactly what I want out of it. I also have Endorphin.es Milky Way effects module, and I would HIGHLY suggest you consider replacing it with a Happy Nerding FX Aid XL. Similar cost and only 6hp, and it's a much more versatile multi-effects module. It may even diminish your Erbe Verb GAS.
Basimilus is fun. Arbhar looks like a blast too. Maths, Ochd, and the stereo mixer are good ideas. I would recommend looking for modules that have CV inputs though, so you can modulate all of the parameters. That's the whole fun of modular. It doesn't look like you can control volume or panning via CV on the mixer you've chosen.
You have the Optomix low pass gate, which is great, but I would recommend adding a complex oscillator to have fun with that. Something like the DPO, Furthrrr Generator, Verbos, etc. will be so versatile for melodies, percussion, and general wacky bleeps and bloops.
Finally, utilities like VCAs, mults, sample-and-hold, submixers, logic, and the like will be very important too, and you don't have a lot of that stuff. Mutable Instruments' Links and Kinks are small invaluable utility tools that should be in a smaller rack like this.
Those were my first thoughts as I looked over your rack idea. I'm sure others will have some good ideas too.
Have fun and good luck!