This case is designed around the limitations of using standard dupont plugs/leads, so is quite bulky.
Hardware required:
m2 self tapping screws
MCU: STM32F405RGT6
https://www.aliexpress.com/item/1005006051651136.html
Display
https://www.aliexpress.com/item/1005005985371717.html
Button
https://www.aliexpress.com/store/912692
Written documentation:
https://github.com/3rdIteration/keepkey-diy
YouTube Video:
The author marked this model as their own original creation.