IMG_6960

The rotary tool that did most of the cutting. Front and rear sides of the back rest.

IMG_6989

In addition, the aileron tie rod between the sticks is in the way and will have to come out.

IMG_6973_em_sa

Here I have annotated the important elements. The red outlines the fiberglass support bonded to the bottom of the tank. Blue arrow points to the blue crack. The crack formed exactly as a stress analysis says it should, at 45º to the corner of that supp