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I think people need to be careful with the JB weld epoxy filler / fibre glass / metalised filler route.
I think people need to realise that from the 1960s all Mercedes cars have been built with monocoque / unibody constructions. This means the structural integrity can not be thought of in terms of "structural" or "non structural". Some parts of the structure are stiffer and thicker but if you remove too much of the structure you end up with a fragile egg shell.
For me good quality welding of new metal is the only option.
I understand that for others this causes a dilemma - it caused a dilemma for me - I had to go off and learn to weld. Pain in the arse!
Although this next bit of advice will almost certainly make more work...
...I think that before anyone decides to treat anything with POR-15 they should get an angle grinder and a wire brush attachment and push this up against the area of concern. If your wire brush attachment travels quickly into the car and you are covered in a cloud of rust dust you will most certainly be upset. It is not nice - but you need to face reality of the situation - rust is not strong - papering over the cracks with filler will not fix the problem. Epoxy does not stick to rusting metal for long - neither does POR-15.
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