Very interesting design (and initiative)!
The SFF is a major appeal to me, so an extra controller the size of the Octakontrol seems more relevant, although it seems problematic to add other potential controllers side by side with the midi connections.
Would it be possible to design controllers that plug into each others like LEGOs, so that you have the trinity + additionnal controllers in front?
Very nice angle and stand design. Would it be interesting to design a controller like a dock-station/stand? Just sweep the box into it, plug, play, no cable fuss.
Love the ring LED knobs. Always loved the Nord Lead 3 layout I thought in phase in the digital age.
Maybe extra controllers for Elektron should also add a joystick to the game.
Cheers