Great news! Sorry I didn’t get to your post before sending the new kit out. At least with 2 Motherboards, you can build 2 devices, and maybe even have them communicate with each other over Bluetooth.
For that, you will need a couple of these: https://www.ebay.com/itm/224313035719?hash=item343a194bc7:g:oYkAAOSw5dNWqqeA (HC-05 Bluetooth module).
I will get around to posting some Bluetooth code examples soon, but the internet has plenty of guides in the meantime.