Nice conversation, helps understanding each other....
But back to the workshop.
Today I parked my Caravan into the in the workshop of the company, where normally plastic parts are produced. Over the weekend I can do there whatever I want, because I always have an eye over the machines and keep them running 24 hours a day. A very good place to work on a car in wintertime, always dry and warm, a little noisy, but all kinds of tools around....

Today I wanted to get an overview about the condition of the inner arch right side and repair it if necessary. So I opened the outer surface carefully to get a look inside.

First I found that the Caravan was damaged in this area before. I found a Polyester layer under the painting. This will cause many problems, because it is difficult to find the original surface - level. But today I concentrated on the inner arch.
First I built a paper model like I always do, then I set it up in metal.

Cut out the rust Rolf!

New part in position and welded in.

Because my time runs out this afternoon and in sight with the polyester problems, I closed the hole in the outer surface with a "temporary sheet". I have to think about to go further. The Caravan is an daily driver. He MUST be useable Monday morning.
More next week.
Regards
Rolf