The project is named "Butterfly" as a nod to the Sigfox logo.  The notion of a "Butterfly-Feather" matched the idea of combining with the Wing concept in a new and unique offer in the Feather eco-system.   The next step in the project plan is to generate the layout and pick and place files.  This activity should be complete by (tbd) date.   Also, just to mention, a future revision of this design is under development  targeting a full FEATHER with ARM M0/M0+ SDK.  This design would also include BLE 4.2 offering a Feather with BLE+Sigfox.  Both radios will be hosted in 1 instance of an FCC certified module from a vendor currently under evaluation.