I have made this box to house my set of Wemos D1 mini boards used as a sensor. It holds up stack of 4 boards (I have a Wemos D1 mini, buzzer board I2C connector board and WS2812 board) with headers and you can slide a display on top and there is space for a temperature sensor on the back (so it wont heat much from inside components and one PIR board in the front. If you solder the boards directly without headers it will accept 6 boards inside (not tested yet).