Having almost completed the re-construction of a rear clam myself, I hate to see this kind of damage. I had to run out to the garage and gaze at my progress to reassure myself.
"Light damage" ... I'm not sure that I'd describe it that way. It looks like someone took a can opener to the rear clam. Maybe he locked his keys in the trunk and someone PM'd the wrong solution to him.

Being a chemist with experience in polymer science, I can work wonders with fiberglass repairs, but this one looks beyond my abilities. Ouch! Definitely new clam time unless the missing bits are still around and not too badly deformed, but this would be a tough one.
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'68 Homemade - yes homemade

; '69 T-Bird Landau 429;
'86 Mustang GT Ragtop 5L; '93 Ford F150;
'06 Mercedes C-230 sw; Lotus Elise - 2008 California Ed., Saffron Yellow;
'05 KG Elise Rebuild Project; 1964 Lotus (Caterham) Super Seven S3
Kubota L3010; Trek 5500; '86 Cannondale