Most of the body is riveted on the chassis. Part of the boot is shown i picture.
But there are some areas where the aluminum is folded onto the chassis.
It´s not easy to unfold them. One have to be patient and work slowly, but even then is the possibility to damage the edges high. To be frank. Some parts have to be replaced.
Some of the tools I used. The C-spanners are modifyed for this application.