I'm really interested in that project, appart of the price of the accordina, it's really expensive, i like the DIY world.
I asked him in YouTube, to share the design, but he doesn't answer (yet?).
I started making experiments with my printer, designing something of the buttons mechanism.
To allow the air pass to the reed (making a small labyrinth inside the piece) when I press the button, and then return to this place with a spring.
But the investigation is very slow...
I don't know neither where buy the reeds or reed kit to have all the notes disponible and continue making.
I found the patent of the Accordina in USA, i found it very interesting and very good explained.
(I found after my design of the mecanism, and it is very similar).
I see that in the patent, works both ways by blowing and sucking air.