If this is too off topic feel free to delete this post, but I finally got around to crossing off building a nixie clock from scratch from my bucket list. Supercap backed DS1302 SPI interfaced RTC, 64 bit serial high voltage shift register, PIC16F886 8 bit mcu, run off mains 120Vac. Warning, lots of glowy shiny pics below!!!
More technical info on my Hackaday.io page: https://hackaday.io/project/160961-diy-nixie-clock