Hello again

To those of you who own, have owned, wish to own or maybe have just seen
480s on the road.

Any tips re. how to best go about patching the digestive biscuit that poses
for a wheel arch on my 480?
Sorry for the glib tone of this message: I have to do all the work myself
and I'm not really sure where to start. I'd just hack the thing with rotary
steel brushes and fill the gaps with mesh and filler but I'd like to keep
this car good rather than just looking good.

Regards
Sammy