Here is new version of casing with small brass screws, columns and buttons in form of screws.

You can easy put your ESPboy in the case anytime or use it without a case.

Can't find better solution. The previous red buttons looks better but you have to resolder SMD buttons at ESPboy's PCB and this larger buttos are close the USB port for uploading the firmware.

Waiting for assembled 10 ESPboys form China )