Cool design! Could you post the dimensions including box and relay?
I understand one can update firmware through the MYSX connector?

Yes a link on https://www.mysensors.org/about/network would be great as I didn't find any mentioning of repeaters other than forum posts which did not end in a definite success message. To me it seemed a bit like a cool but undocumented feature

Thanks, I guess the repeater node will be the best solution but I couldn't find the official documentation for enabling it. Solved the problem with the antenna mod for now:
https://forum.mysensors.org/topic/1851/extending-range-of-regular-nrf24l01

I am experiencing many ghost sensors and new sensor variables like wind sensors etc. which I have not connected nor built at all.
It happened after connecting a second Wireless Gateway to reach some sensors in the garden.
Is this actually supported or should I find another way to increase range?
Thank you