Back on the ATMEGA breakout - We could use something as simple as:

https://tiny-circuits.com/shop/6458/

Or use a custom ribbon cable out to this connection type:

https://tiny-circuits.com/products/tinyduino/

I am going to look into designing a rear case which can hold and have the breakout connection popping out of the rear so I can just plug a shield into the N900/Neo900 case!! SEXY SEXY NERD DEVICE!

This way I can just swap the rear case between standard and one I design/print which is hold a tiny duino - Hopefully connected to your pins under the board....


Edit: @Joerg: With the "other half" connections you have planned, will these have power running through them? If yes, what is the voltage??

Thanks! I have a little idea planned