Spent two or three days stripping the rear section. Turns out there really is nothing either original or properly aligned. The lower horizontal cross section is banged up and missing large sections. I guess the good news is that I can work from scratch, the bad news is I haven't got a clue how to start... It'll have to start with the outside of the cross section so that the spare wheel cover will fit properly again, then the inside box section. Then work from there - sounds simple, ehh?