3 D Printing an ARDUINO MIDI Controller

I m a beginner in all things Arduino and I ve been working on an easy, fast, and cheap project to learn more about it. I built a DIY MIDI Controller for finger drumming inspired in MIDI Fighter, using an Arduino Leonardo and 16 Sanwa arcade buttons. I designed and 3d printed a unibody enclosure inspired by Mac Mini that exposes the electronics and needs no screws Stepbystep tutorial with downloadable case and code, and electrical wiring scheme: