Lithium battery for a 800V power inverter

We need to do a resizing of the pcb's for a high voltage battery to the sketch in the "Melacs 800V battery.pdf" file, to a new layout. The main task iOS to divide an older layout from one to 4 sections that are to be connected in series, and fitted into a 19" rack box. Each section will have 175V each. Also we need to make safe layout and add any aft feature necessary in the build, including on-off, fuse, pre-charge function or similar. The older BMS circuit ("BQ76PL536") need to be replaced with a current available equivalent. The older design files are possible to use and change.