I'm able to run, customize a bit and run again PiClock3 manually. No problems there. However, trying to get it to start on reboot - tried two ways, first was a crontab -e, added '@reboot /usr/bin/python3 /home/pi/PiClock3/PyQtPiClock3.py' but it refuses to run because qt.qpa.plugin and qt.qpa.xcb could not connect to display, need to reinstall Qt... so I wrote a display.desktop in /etc.xdg/autostart with similar command to run PiClock3. However, it gives me the Unhandled Error on boot and does not execute the program. I can open terminal and run python3 PyQtPiClock3.py and it starts up just fine! Seems problem is running this so early in startup?
looking forward to your map update!