Rustoration Heeeelp!

Thankfully the floor board isn't rotted, since I just poked that hole today. It wasn't through until I started smacking it with a screw driver to figure out the extent of it.

I don't mind removing what's needed to gain access. I just don't want to burn holes in my cowl trying to learn to weld!


How much should I remove and replace with donor cowl? just what is eaten?

Also, do you know how water gets in there and eats it out? Both the inner and outer cowl were eaten from the inside.