Wow, this brings back memories of my first planned case. My first plan had many of these modules included. Let me just start by saying that you will almost certainly end up with a MUCH different collection and arrangement of modules than you have assembled here.
You are on the right track as far as case size if you really are committed long-term to putting a versatile rack together, but many of your modules have overlap (Shifty and uO_C, Branches and Marbles, for example), and some you have probably chosen because you see them in a lot of other racks. Maths is cool for its versatility and as a learning tool, but it's not always intuitive, and the same goes for Rampage. Could you get dedicated modules that achieve the specific functions you want? Or is the exploration more fun for you? You will probably want modules that have a wide range of patch points so you can modulate as many parameters as possible (i.e. "modulate the modulators").
You'll probably want to invest in Pamela's New Workout and the upcoming Clouds update instead of the older discontinued versions. Mults will be mega-useful, but try to keep them outside of the rack with those little in-line star-shaped splitter thingies so you don't take up limited rack space.
First and foremost, invest in a big case but only a few must-have modules. As soon as you start patching those first few modules, you will quickly realize what is missing for the sound you are trying to create. If you find yourself reaching for something that isn't there, that's the next module you should invest in. Do a LOT of research to avoid buying something that isn't going to do what you want. Wishful thinking will not make it fit into your sound and workflow. The more research you do, the fewer duds you will waste money and time on.
All of us here would likely recommend very different modules for generative patching, but the concepts of generative patching transcend specific modules or manufacturers. Check out mylarmelodies excellent video about generative patching ideas:
Go slow. This is a big investment, but above all, have fun!