Some manufacturers have a way of "officially" replacing the chassis, as in getting the chassis as a replacement part and procedure to replace it. For example s

Some manufacturers have a way of "officially" replacing the chassis, as in getting the chassis as a replacement part and procedure to replace it. For example see BMW part number 51 71 7 409 410, chassis for F16 https://www.online-teile.com/bmw-ersatzteile/51717409410_Body-Skeleton.html?language=en&model=1 https://www.online-teile.com/bmw-ersatzteile/51717409410_Bod... The law might look this or other way depending on where you are.