McPherson dome in Typ 43 Audi 100 corroded..

[robwill2 at wxs.nl]

Hi all,

On my Audi 100 (1978) typ 43 one of the McPherson 
strut domes (mounting points in the wheelarch) is 
corroded to some extend.
Is this repairable??
In a booklet I have over here once there were metal 
cappings available for reinforcement: they were plug-
welded over the weakened top of the dome..
Problem: these caps are no longer available while 1978 
seems too long ago :-(
I think it may not be possible to mould such a cap myself 
from sheet metal with hammer and dolly (the metal to be 
used is too thick to form it in multiple curvatures (??).
A good dome from a scrap car may be hardly possible to 
source, while these cars seem to be nearly all converted 
to iron-dust... 

Has someone a good suggestion on this?
I would really like to revive my oldie (the engine runs nice 
now (2 litre, 4-pot, carburettor) after some adjusting of 
ignition; has done 200000 km's yet!).

Bye to all,
Robert
robwill2 at wxs.nl