too many voices - 10? maybe - I'd only want to 4 or 5 max in this size case otherwise there is not the space for the modulation sources or utility modules to support that many voices - and those that are there are not well chosen
is this meant as a 'performance' synth? - ie totally hands on twisting knobs and nudging sliders - or is it meant to be more self playing? - ie you patch modulation sources to modulation inputs on modules so they alter over time and can do crazy things like FM and AM synthesis
solutions - double the size of the case or throw out half the modules and fill the rest with modulation sources, utilities and performance controls
or start really small (just Maths, maybe, considering you have the minibrute) and grow slowly - working out what you are missing for what you are trying to do along the way
"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