I usually tell people to stand back when I start
but if it is metal, you can fix it. Just how much work is up to you.
It looks like a shelf, battery tray and support at the least. That is a common fix for 914's so the parts are available and not too $$$. Do you have any pic's of the fender well the battery tray is attatched to? If that doesn't have any holes rusted through it, then the job will be that much easier.
Can you weld/grind/cut? If so, you could do it.