What speakers/mic/battery/wifi dongle would be best to pair with this if I wanted to make my own open version of the Amazon Echo? I could see printing a 3D she

What speakers/mic/battery/wifi dongle would be best to pair with this if I wanted to make my own open version of the Amazon Echo? I could see printing a 3D shell and selling a kit for $20 with the appeal of users being able to easily break it down if they wanted to repurpose the RPi.