Thanks for the note about the orientation of the tube, wasn’t sure if it was important. I originally based it on the photos from this blog post which shows the tube installed upside down: https://www.uradmonitor.com/model-kit1-production-ready/
I’ve swapped it around now and am looking for an enclosure to mount it in. Are there any specific requirements? Plastic, metal, height off the ground outdoors? Also if I was to add something like the BME280 would there need to be holes in the enclosure rather than having it watertight?
Regarding powering the device, something like this kit would be very useful: http://www.tp-link.com/en/products/details/cat-4794_TL-POE200.html
It allows you to inject a 12V into the spare cores on an Ethernet cable and pull them out at the other end (it’s an injector and splitter, and not a standard 802.3x POE).