[Paul Gallagher] has the answer in one case, he’s used not one kit but two of them as for a guitar tuner project ... this ATmega168-powered project with MIDI-out.

Body Dimensions 164.5 x 76.2 x 8.1 mm (6.48 x 3.00 x 0.32 in) ...

alphaTab is a cross platform music notation and guitar tablature rendering library.