This small case is designed for the open source hardware B-Parasite. I made some firmware that allows it to work via zigbee. Check it out on my Github page.
For assembly you need three treaded inserts with an outer diameter of 4mm and an inner diameter for 3mm bolts. Simply slide the mount part (see stl files) from the bottom up until the screw holes aline. Use 2x 3mm bolts to mount it in place. Now, you can slide the cover over the top and secure it with another 3mm bolt.
It is not yet fully optimized for the internal light, temperature and humidity sensor.
The author hasn't provided the model origin yet.