I agree with Starthief that you should go slowly and not rush to fill the case.
Out of curiosity I built your proposed plan on ModularGrid. For a start, the Arturia Rackbrute case is actually 89hp wide (1hp wider than your picture above). This means that you can fit the 2hp wide Arbhar expander in there, which is included with the Arbhar module, should you go that route.
That bottom row is interesting. I’d argue that the Magneto and Mimeophon cover a lot of the same ground, both being highly modulatable delays (although you can go into some stranger places with the Mimeophon if you treat it as more than just an effect).
To some degree the Morphagene and Arbhar also crossover with each other. I wouldn’t class either of them as being a realtime effect. They’re more sound sources that you record into and then play/manipulate/trigger. I think of them as instruments in themselves.
Personally, I went with just one of them in my rack, an Arbhar, as it seemed more flexible and intuitive and I love granular processing. However, if you’re more into the tape manipulation side of it then Morphagene (or an Instruo Lubadh) might be a better fit. I wouldn’t advise getting both Morphagene and Arbhar though, at least not to start with.
I would certainly wait to see what a Clouds successor might bring to the table. I use an original Clouds alongside a Mimeophon and an Arbhar for my granular and effect processing. And, yes, a guitar via Ears into a combination of those modules can get very interesting.