The clock comprises two circuit boards. There's a board that holds the tubes and buttons. There's another board that has the power supply and other various components. The high voltage power supply I copied from a kit I got from ebay. I simply copied the circuit into my schematic and used the components from the kit on the PCB I made.
My first clocks used the common Russian driver chips and I used multiplexing in order to achieve dimming of the tubes.
This time I wanted to use some HV5530 chips that I had read about from other people using them for clocks. They work really well and are a LOT simpler to integrate and dimming is achieved by the ability for the chip(s) to blank. So it's a straight forward matter to just vary the tubes on and off cycles via this blanking feature.
So from there all I had to do was design the rest of the circuit and make a couple circuit boards and then assemble it.
I Tested the look of it with a piece of black acrylic which seems to look pretty decent.
Now I need to make some sort of case for it!