Alright so I've had a go at filling out the rest of my system for future expansion, taking inspiration from @Lugia and @greenfly's builds:

ModularGrid Rack

Would love some feedback on this as a potential end-game system. Have I missed anything obvious?

Everyone needs at least one Maths in their setups. I have one in my shared system and love it so much that I ordered a second maths for my palette sequencer case. Get the cv.ocd box let’s you send midi to cv from your Elektron gear. I use mine with my Octatrack and modular plus you won’t waste precious space in your rack for a similar module.