I love this boombox-customizer-thingie from IKEA and Teenage Engineering! Great, portable sound and made for hacking things to work the way you like it. Also includes a thicker "long bar" that can be used on top of the shorter spacers with a longer 5mm screw. Use a 12mm (countersunk side) or 14mm (non-countersunk side, so you don't protrude longer than the 4.5mm that is available. Get other parts here https://www.thingiverse.com/thing:4153752