Ah i see you have a mult but it is way to big for a small case. I would ditch the ripples get a freak instead. If it is for studio use you don't really need the mixer adsr i would also recommend from 2hp. Generally unless you plan to build a monster case every hp is essential. Plaits and Manis have already a vca in them so i would ditch veils and get also a smaller vca for example 2hp for the spectrum module. Or get altogether a vca with build in envelope like the pico mod.
This is my rack so far i make industrial techno. I use it along a with a Tr 8 run through a distortion pedal. With the Mysteron i am not so happy since the soundpalet is not so big. Next modules will be plaits and clouds then Loquelic Iteritas Percido , cursus versio, mimetic digitalis and 2hp hat. I am also planning to sell the milky way and get another fx aid xl. Sequencing i am with beatstep pro and korg sq-1