you're never going to construct a lightweight pack with cylindrical (18650/21700, whatever) cells.
a real light weight battery construction isn't going to have redundant casings and fuses; it'll be the bare minimum pouch/plate style construction, the bare minimum fuses at main junctions, and as light a protective shell as can be produced to house it all in. It probably won't have a BMS of any kind on board, with the functions handled up-stream from the battery.
here's something close, although with plenty of weight compromise for reliability and safeties' sake. : https://global.honda/en/tech/motorsports/Formula-1/Powertrai...
While that's technically true for highly specialized applications such as an F1 car such as the one you listed, the parent article is discussing USB compatible consumer battery banks. Consumer battery banks are worth building with cutting edge-but-still-mass-produced cells, multiple layers of redundancies, and integrated BMS.