On all series alpine and mark of tiger the joint between the rear scuttle and wings are filled. The cars often have hairline cracking later due to the body twist.
Might be worth adding the fillet braces under the car between the rear legs and rear of the x brace which is basically a pivot joint in the uni body.
As a side note when we converted my fathers sivgt to a soft top we hade to remove the steel braces that go from the rear parcel shelf to the rear scuttle and wings. A year later the car had hairline cracks on the joints. After this i carefully paid attention to this area on cars when viewing them. I never saw a gt alpine with the issue.