Recommendations and advice regarding building a 12s 4p

Planning to build a 12s 4p battery. Thinking of using 21700 cells P42a. In terms of Bms, bypassing for discharge, what charger to use (to charge battery), fuses/ non spark on/off switches, what is generally recommended? I don’t have a wiring diagram yet (since I haven’t selected a Bms) but I am wondering what I need to consider in terms of safety/ failsafes and what I described above.