In a nutshell, this is what I changed on my kit:
- special emblem '70 years' between the seats
- additional clear part (windbreaker?) on the upper end between the seats
- different coloring for the dashboard, extra red lines, red details on the air vents…
- of course cut off door-roofs with A- and B-pillars, and removing the middle part of the center roof
- filling the recess in the center of the b-pillar-roof in front of the rear lid with putty
- twill-weave C/F decals with black painting and add. details on the new A- and B-pillars
- rework the doors so some part of the C/F structure underneath will show (above the side indicators)
- body painted with Zero Paints Canna di Fucile, as I liked the first presentation car quite much
- red decals similar to FXX-K from a Studio27 sheet
- special emblem '70 years' on the sides
- special license plate