had a few patch panels to make and weld in . 
that's what you think from that pic .
but from a guy who has done lots of body work on rusty stuff like this open it up / grind it down and then figure out how big a patch you will need .
I'd sawsall out a 2' "cube" of the donor if it's going to the crusher.
Otherwise, "I have too much to work with" said no-one ever.