I designd a new (may be better) case from scratch: thing: 2820147
This is a remix of: https://www.thingiverse.com/thing:1944905
The case is slightly larger because the recommended battery is hard to obtain here in Germany (or may be Europe). The one that I found is slightly larger with the following measurements: 65mm x 40mm x 6,3mm
So I grabbed the original files and changed the dimensions to fit the battery that is available here: https://eckstein-shop.de/LiPo-Akku-Lithium-Ion-Polymer-Batterie-37V-2000mAh-JST-PH-Connector
While I was at it, I also added a wall mount where the weather station can be dropped in easily.
Thanks to Adafruit for this great project!