I really liked 3DTron's Wemos D1 Mini V4 case, but I wanted to mount it under a desk to control Neopixels with WLED. I also needed some more room inside the enclosure for some terminal screw blocks so I could add a usb plug to power the Neopixels directly. The holes are designed to accommodate some #8 wood screws for mounting it under a wooden desk.

Future improvements to this design may include adding an angled lip to get the cover to “click” in place. As of now it's friction fit as the original design was. While I feel the lid will stay in place mounted upside down, I still added a little dab of hot glue around the outside of the lid. This seems to have worked perfectly for mounting this upside down.