No, the Bathgate Locomotive Works manager has not thrown a tantrum! When one doesn’t own, or have access to, a set of bending rolls then lateral thinking comes into play.
The fallplate below the smokebox has two curves.
The following show the evolution of the two curves:
Front plate with hinges. Sometimes the smaller jobs take longer!
Managed to make a couple of hinges. Initially problem with the two plates heeling required slight adjustment and rounding the two meeting edges.