Let's start by getting all the parts together.

For this project I used the following parts:

• Feather Huzzah
• FeatherWing OLED
• Lithium Polymer Battery
• Pictured is a 1200 mAh battery but I ended up using a 500 mAh battery I had as it fit inside the case better
• FeatherWing Doubler
• I could have stacked the OLED and Huzzah but I like the way they look next to each other on the Doubler
• 4 x AA battery case that I had and was not using
• I could have 3D printed a case, and might still at some point, but I wanted to put this one to good use

You will also need something similat to the tools pictured above. I mainly used these tools to hack the case to make the Huzzah, OLED and battery fit inside so in reality you can use anything you have to cut away parts of the plastic case.