Frame and torque box are repaired first then the rocker panel.
After the frame is repaired the damaged quarter is removed.
New parts had to be pulled into correct position since this body was repaired incorrectly years ago.
The other damaged quarter is replaced.
When replacing the floor and seat risers we use a jig I designed to return the seats to the correct height. Some shops that do not specialize in Mustangs do not do this.