Cowl Trouble

Today I started with removing the surface rust on the cowl at the fender side.
Then I cut a piece of rusted metal away to replace it with some other metal.

What I then found is unbelievable. The inner cowl around the air inlet to the drivers compartment  is badly rusted. It had been previous repaired by inserting a piece of metal from the inside and then glassed everything together wit fiberglass. On the drivers side the inner cowl is rusted trough.

 In the picture above and below you can see the Fiberglas and other stuff to seal the air inlet.

 After removing the gunk the only thing visible is rust and a few holes where the inner cowl is rusted away.

 A snapshot of the air inlet the bottom is almost completely rusted away.

I think this needs some drastic approach.
Removing the dashboard, windscreen, hood, electric cables and the steering column.
Then cut out the outer cowl to get access to the inner cowl and weld in some new parts.
But that is not for me to decide.