2cv Bonnet hinge repairs

The problem occurs when not enough attention is played to the area behind the bonnet as soon as it occurs. Rain water enters under the factory mastic and penetrates very deep and fast.
A close-up of the holed area shows the depth of the problem.(like this all the way across) This is a 1989 car and had this amount of rust in March 1999 after careful looking after and at least one repainting and resealing.
Before I knew the full extent of the holed rust. I thought I would just use this minor 1st hinge. But when the factory hinge was removed the full extent was obvious. See next pic.
The last pic shows the full panel which is to be let-in and goes completely up and under the vent flap.