XK120 FHC rear window area refurb

Has anyone taken their rear window off only to find that a lot of the flange that holds the screws from the surround has lost a lot of its flange?

If so, I need to know what steps you took to rebuild said flange and build up any of the metal comprising the back opening that has been rust compromised.

Sorry, I wrote this in a hurry. I was hoping for the most time since my discoveries for anyone to answer. I have to go to a commitment now though.

Thanks, in advance and best regards, Brian

Best you can do, is to fab up a new lip, out of sheet steel.

LOTS and LOTS of trial fitting is needed. This assumes the curved bits to which that flange is attached arent rusted away, too.