The one of the decimal points can be used as AM/PM indicator in 12 hour mode. Several of the others can show you the status of the optional motion sensor if installed.
I would suggest including connections for decimal points on the board you're working on. It doesn't cost anything to include and you might find it useful. Tie the decimals of all tubes together same as you do with the digits.
Look into it later when the dust is clearing off the crater.
I would like to make a homage of the Concrete Nixie with z560m tubes.
The tubes should be fixed in sockets.
I have finished the footprint so far, I just have to check it again.
I also use Kicad. Ian, do you have a footprint for the Rev6 board?
Back to the points again:
The tick LED flashes every second, is that all it does at the moment?
when is the decimal point in the tubes activated? Also every second, or does it show other information?
That's all right. I didn't recognized Ty's answer.