Recently I completed my own MPi3 player project.
The hardware consists of a Raspberry Pi (running Volumio ) with Hifiberry Digi board.
I designed the enclosure with Blender 3D (an open source 3D program), starting with a default cube.
The enclosure was printed on a 3D printer and then polished and painted.
Inside the MPi3 player (back view)
Inside the MPi3 player (front view)
The MPi3 player is now a functional part of my Hifi installation.
More details can be found here: http://www.karinennathan.nl/mpi3-player/mpi3-intro