I kept cutting until most of the rot had been removed.
The front end of the sill.
Here is all the metal I cut out from one side, the other side was the same!
The clean began by clearing as much surface rust that was left with wire brushes in a drill and then if needed with Bilt Hambers Deox Gel and then painted with Hydrate 80 rust treatment and then finally painted with their Electrox primer.
New sections where made up to replace everything that had been cut out.