It's the mod linked below, but I only link it to give credits where credits are due.
You need my personally modified sliders for BBW range and I can't post zip-files here.
Whoever wants my modified mod, can dm me and to get them via discord.
Then just put the unzipped content into your modules folder and don't forget to activate it in the launcher!
You don't need the link or download anything else. https://www.nexusmods.com/mountandblade2bannerlord/mods/2134
below some screenshots of my weight and build sliders...