this is only a minor modification to the top part that allows to expose the board's LEDs (better with transparent light guides) of the board.
Thank you again @Retro Frog for the design!
See also my Midi Remix for more details: https://www.printables.com/model/784026-mister-fpga-midi-size-console-case-remix-of-retrof
The author remixed this model.
top part modification for LED guide