OK
The plates have been blasted and passivated.
Still have the 6N5N6N configuration but this is not the final config.
Removed the PWM from the circuit.
Added flake KOH until I was indicating 15 amps @ 13 volts. (like a pound )

After a short run the voltage at the reactor dropped to 12.25.
At the moment the gas output is more than I've noticed before.

Only way to measure success is drive it for a tankful I guess...

More to follow