This is what the rear end looked like with the chrome bumper off.  The car was hit in the early 70s.  They would not straighten the metal just fill in the dents with gallons of bondo and bronze solder to plug the holes. 
     Dean cut out the bottom of the rear end.  He then welded in a new rear end panel as you can see.  The trunk floor had to be reattach to the panel.      Also remember the gas tank is right there.                   We went down to the metal.  Now it is all metal with very little fill.  All those gray spots are the welding of the trunk floor.