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Hi,
A lot of modules for that case.
To run this, you'll need at least 88 more HP.
I'd start with BRAINS, CHAOS, ABACUS, and SKIES.
I'd choose smaller VCAs, for example https://modulargrid.net/e/doepfer-a-135-2-quad-vca-vc-mixer. It's inexpensive and is a Doepfer.
Regarding attenuators, instead of the Doepfer, I'd recommend, for example, https://modulargrid.net/e/befaco-atte. With it, you can invert the signals and it also gives you offset.
To output audio, a stereo mixer with send/return takes up a lot of space, at least 20 HP, so you'll either go for a larger case or opt for an external mixer.
Try this, and then you can add HALOS and Black Hole DSP2.
Ferran,