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Ergonomics. Your rack is dominated by 2HP units. If you have 2HP to fill or if its a module that doesn't see a lot of time between your thumb and index finger... fine. But take a step back and think of how much you're going to be tweaking a knob and you'll grow to hate working with those micro-pots... especially if they are crowded together.

A lot of Eurorack is finding the "sweet-spot" by turning a knob. So be careful about making HP the main consideration. You'll get more modules... but they'll lack in functionality and ergonomics.

$0.02.