Tackling the E46 sills advice needed

[Ash160808]

Hello people so I work in a car parts company and ordered the sills in to see if they was what I need and it's spot on. Basically I'd say 3/4 of the underside of the sills (the strip that contains the jacking point) is gone.
My question is can it be rebuilt back up with metal plates or is it better to have a whole new sill put in??
I can take some pictures if that will help.
People see rust on the sills and say oh just scrap it but to me that seems a bit drastic
Anyway thanks for reading