Okay. If you wanted to make a techno song on this, what elements are going to be in your mix? Kick, snare, hats, a bassline, a lead, some chords... what else?
Do a mental exercise of where each of these elements will come from. What will they be sequenced by? Where will you get all the triggers/gates and CV/pitch from? As far as the voices, how will you make each one? What modules will you need in audio chain for each voice? Some modules are self-contained voices (like BIA, Braids, Atlantis). Others will require filters, envelopes, VCAs, etc... don't forget any modulation (the strength of modular synthesis).
How will you combine the outputs of all of these voices and apply effects to them when desired/warranted?
If you do this mental exercise and work backwards, you might have some second thoughts regarding module selection, module size in HP, mixers-submixers, etc. Once you've done the work, you might find that you need more utilities than what you have... that you will need more rack space, and things might be much more expensive to get the level of functionality you'd hoped for.