Hello Robert, sorry about that picture, didn’t notice it. I’ll have it replaced when I get the chance.

While a Geiger tube is just a two electrodes discharge tube and there is electronic charge requirements in that regards, the polarity is still important because of optimisations made in the materials used: the cathode is a large surface material responsible of electron emissions, while the anode works as a charge collector and is usually a tiny wire.

For some tips on installation, please see the article for model A, the facts there apply to KIT1 as well, except that the KIT1 doesn’t have an enclosure: https://www.uradmonitor.com/tips-for-installing-the-uradmonitor-unit/

If you plan to use a BME280, you’ll need it to communicate with the air outside. Some holes (at the bottom) are needed. For POE you can use a passive one like:
http://www.ebay.com/itm/Ethernet-PoE-Adapter-Injector-Splitter-Kit-Supports-5-12-24-48V-Power-over-/172236498811?hash=item281a18677b:g:8ykAAOSwepJXV9P1

Or one that has built in DC-DC converters to increase the voltage for transport and then reduce it back to 5V at the end.