First up, a mult in this small of a build is pointless. In the event you need to split off a signal, just use inline mults. You might only need one or two with this.
But the problem here is that if you're aiming for "ambient noodling with samples thrown in", this build is sort of not exactly "synth-like". True, it has AN oscillator and A resonator, but there's virtually none of the modules that you'd use for modulation, no VCAs, no...well, just no, really.
Definitely follow Jim's case advice above. Even at 1 x 84, you get into cramped spaces if the build needs to do something complicated. Think Mantis, Palette 104, etc; 60 hp might fit a Moog device, but that's MOOG and what they can do with a prepatched, prebuilt system. Once you step into modules, you need space for both flexibility while setting up a build AND ergonomics so that you've got real knobs and sliders and such. These clones here aren't as bad about that as some I've seen, but they're still going to be an impediment unless you've got fingers the size of chopsticks.