hope you have time and patience
 
that is quite the project, a rear-ended then rolled over cavalier. def a good project rebuild. most people wouldn't be willing to take it on.  the roll over damage is light so thats a fairly easy fix, but the damage to the left rear is going to take some time and effort.
 
good luck, im looking forward to the progress pics.
http://registry.gmenthusiast.com/images/my2005cav/my%20car%20the%20bash.jpg
 
 
^^ Your assumptions are actually incorrect 
it happend in January it backed in to a ditch hit a fence post then flopped on the roof 

 single car accident