Hi Agarthha!
you really need to spend some more time researching - and think bigger (case), but start smaller (fewer modules)
you probably don't need ears (at least for inputting from digitone) - both morphagene and clouds are stereo anyway - both also work at both line and modular levels - you might want the envelope following or contact mic functionality though
whilst ochd is a great module - I would expect something like a maths to be more suitable - it is more hands on and more versatile - you'll probably want more modulation that is controllable - there is very little control over ochd and it only offers triangle waves shapes ) that's not to say don't get ochd - but I would get maths before ochd - see the illustrated manual (google) and marvel at it's analog patch-programmable computerness!!
you may be better off with chaos rather than random - triple sloths for example instead of wogglebug - random is random - chaos is a bit more centered
I would also add a kinks and a matrix mixer to help create more interesting modulation and some filters and other effects - fx aid xl, for instance
you will almost definitely want vcas for both modulation and audio - get a quad cascading one - veils or intellijel - they can also double as inputs if you need them to - as both of those VCAs are actually amplifiers! veils also has decent saturation - idk about intellijel
you'll also want some basic envelopes for those gates - to feed the vcas - if you want more keyboard like pressing get ADSRs, other wise ADs or even Ds are generally fine for most things
I would advise strongly against starting with such a small case - 104hp/6u is a more sensible starting point ) this will leave you space to expand - you will need it - Mantis is an excellent inexpensive choice with good power - and it is still tabletop/portable
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities