@frown3n I can recommend you check out this link https://www.modulargrid.net/e/forum/posts/index/9906 which is huge thing I put together months ago... the info / links at the top of that are relevant to "generative." It is food for thought, maybe too much food for thought... But overall the links are very interesting, and include deep & helpful stuff from Lugia, Farkas and a couple others from the forum. You'll glean a LOT if you dig into those posts and the example racks esp. those by Lugia, and his discussions of what's needed in the generative racks.
A few additional comments:
-- I love switches! Boss Bow 2, Switchblade, etc. My next major push is to be able to sequence sequences via switching (Boss Bow 2). Of course one can switch anything: audio, CV (envelopes, LFOs, etc). IMO adding some addressable (CV/gate/trigger controlled) switches adds a huge amount of depth and power to a setup. Verbos Sequence Selector is also worth considering.
-- in addition to switches, you could use additional Logic modules (e.g. OR/AND/XOR, etc.), maybe a couple clock dividers / ratchets (Doepfer has a lot of good options on this front), a derivator (like Joranalogue's one, or Metabolic Devices Coherence), plus more utilities like buff mults, averagers, and something like 4ms SISM to help you combine / wrangle CV from multiple sources. Joranalogue Morph 4 is worth consideration for mixing / mangling signals. The general theme here is, of the signal sources you have, what would be interesting ways to multiply, mangle, and recombine these? Logic and clock dividers also tend to be low on $s and HP so they're a great way to add power and depth with relatively low cost.
-- check out some "chaos" modules: see https://www.modulargrid.net/e/forum/posts/index/10358 especially the last post there by a guy doing ambient installations in art exhibits. Really interesting.
-- 1 or 2 Instruo Ochd units are worth considering. Lots of additional LFO signal for little HP.
-- your build above has i) a packed case ii) a bunch of big modules. If at all possible, try to have 20-40% of your case space left over so you can add more modules in the future without immediately needing a larger case. In other words, you might consider your next build having a considerably a bigger case! You may also want to consider if your biggest modules above are better for you than several smaller modules.
-- Since you have Metropolix, getting it's add-on would give a lot of functionality for little incremental $s and HP; more signal to play with and route. And if you like the "sequencing sequencers" and/or switching ideas above, then you can think of split duties between your sequencers. Tiptop Z800 IMO is a great "companion sequencer" if running more than one unit.
-- I love that you have Scales in there. That will give you a lot of flexibility to extract pitch information from your non-stepped CV, or to have totally independent control of potential pitch values (e.g. by setting custom scales in Scales, and changing those with CV, which is what I do). Yes, most sequencers will already have quantize-able outs, BUT IMO there's a lot to be said for having independent quantizing lanes in addition.
-- I'm not really seeing any modules in your rack that I think are total mistakes, I see a lot of modules I love. But I am left with the impression you'll probably end up needing a larger case and some additional modules.
Well this turned out way longer than I had planned. Hope at least some of this is helpful! Good luck, and enjoy!