my first big project - BMS - is it possible?

Of course, it will works only with "floating" opto-analog boards, that I mention as second improvement somewhere earlier.
Advantage to go for this switch is high timing performance, I really impressed by 107 us check-up time for 12 cell battery by MAX11068, = 9 us per cell !
It capable get dynamic cells data, when battery extra loaded by starter motor and internal resistance of cell show up in bright light on stage.