Great advices, thanks!
I'm recording either with eurorack to jack cables into my audio interface, or through HPO into a small tascam recorder.
For mults I have a 2hp buff that is not included and Tiptop stackables.
Regarding the case, I must admit that I looked on Etsy for some more unique options than the Mantis and I could not find anything except 6U 88hp. But I'll keep looking!
Indeed I was thinking about Maths, however combined with Kinks and Shades, I believe I can reproduce most of the functions I found in the illustrated supplement. And yeah, FX Aid XL is awesome and on my mind a lot! :)