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I can attest to what Lugia says and the smallest I could make a useful bit of kit was a 4u Intellijel 104 HP palette case and even then was challenging but used a large module Queen of Pentacles that has filter, 7 drum voices, and effects built in as my main sound source and most other modules are support modules. Then my other small setup is a 7u Intellijel case with mostly sequencers and support modules. I love having a monster case that really helps for larger modules.