Hi Nantonos,
I did check those type of boards initially but given the simplicity of the midi interface I just made it up on a prototyping board with a flying 5 pin Din socket. I also included the LCD and IR detector on that board as well. However I eventually swapped to the Fluxamasynth board as it gave me a high degree of portability (one of my main design aims, as it is not much use having a highly portable instrument like a flute and then have to lug a huge midi key board for accompaniment).
The attached photos will give you an idea of what it looks like. The center pin on the header on the Fluxamasynth board has a flying lead soldered to it that plugs in the Second serial output on the Meg 2560 board. Instant Midi 
Cheers, Rob
