Consider me in with farkas and troux. REAL generative work requires a much more comprehensive system. Trying to do this in 42 hp is a grave error. Also, picking up ideas from YouTube is dicey at best. Some YT "influencers" do these tiny builds, it's true...but as farkas mentions, they're "mission specific" as a rule.
As an example, here's one of the first, designed and assembled by Bob Moog working in tandem with Joel Chadabe at SUNY Albany: https://modularsynthesis.com/moog/cems/cems.htm Now, sure...this is a 5U synth, and it was put together around 1970, but the concept of generative patching in Eurorack remains much the same in scale, although these days we have more options for elaborate timing behavior and CV generation/modification that do tend to shrink things down somewhat. Also, Moog's modular systems could be a bit of a bitch to get working in a generative configuration because they were missing things like logic, probabilistics, comparators and other related devices, etc. But the upshot is that it's not even really possible to do a FULL-BLOWN generative patch on even a 2 x 84 or 104-sized Eurorack. You simply need too many modulation sources and the modules to "read" what they do to output notes to make this work optimally in even those sizes.