I designed this sensor housing for the SCD41 from seeedstudio. Since I wanted to mount the sensor hanging from the cable, the cable is fed through from below. I used a M12x1.5 cable gland. The sensor is mounted in the inner part, you can either cut the thread by hand or use spax, wood or sheet metal screws. I followed the installation instructions from sensirion. The sensor is protected from light and direct environmental influences, but has sufficient air circulation in the housing.