I decided the hardware was small enough to fit on 2 PCBs on the backside of the VFD: one PCB for the 4094s and one for the rest.

The first PCB contains just the 4094s.

The second PCB is on top, containing the 3 diodes for the filament, the boostconverter, the voltage shifter transistors and the microcontroller.

In the middle is a sandwitched mess of wires...

And eventually, this is how it looked after I put in the initial firmware.

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