Most of the people you’re citing for inspiration have ModularGrids you can look at. You’re mostly on the right track.
As a note, none of them are big on utility modules. Something you may want to emulate or not.
You’ve got the double Rings going on, so you’re pretty set on plucked string sounds - though I would suggest replacing one with or adding a Plaits for some more variety of exciter sources. It also gives you what you’d get from a basic VCO. Though you might still want another! Depends on your goals!
You’ll want some kind of granular processor. Clouds or Morphagene probably; probably not Nebulae. There will probably be a Clouds successor announced within the next few months that’s 14hp. You may wanna wait for that depending on your budget and timeline.
Instant Lofi Junky has been critical to most of those artists’ sounds at some point or another. You can decide whether you want that wobble or not.
Re: variation: You’ve got TM, the quad VCA, and Stages, and Maths - you can build some pretty complex random sources with those as is. Chance would give you gates as well. Marbles would give you gates and more musical CV as well. Sloths are good to look at too as Alanza suggested.
As far as Filters: Three Sisters is incredibly useful and everyone on this forum will (rightly) suggest it. It’s secondary function of mixing is also quite helpful. There are a lot of filters out there though.