Hi Mosher,
Thanks for your interest! Sales will reopen soon. This time an enclosure and stand will be available as interest were very high for them.
Regarding the temperature sensor being close to the ESP, the internal temperature readings of the ESP are included in the calculations to work out the temperature of the room. It’s not a mistake, think of it more of a trade off. It was always a factor during the design as the end goal was to make this board as small as possible.
If you would like to improve on the calculations then you can easily change the config. The config is freely available and I would love some feedback 
Additionally a temperature offset is already available in Home Assist if you’re happy with the calculations but would like to simply add/subtract a fixed value.
Here’s a comparison of the Unity temperature sensor with another off-the-shelf sensor:
Hope this helps.
Thanks!