i am going to make kits to convert your leostick into a full sized arduino board if anyone is interested. the boards also have plenty of space to prototype leostick to arduino (click to view in 3D)
i used eagle cad and used eagle up for the 3d rendering. google eagleup its is really good.
it will be open. why not? the leostick is open, the arduino is open, practically everything is open.