As to so many questions the answer here is: ShoeGoo!
Try shoegoo-ing a piece of lexan under your damaged areas... if it's not flat, try to bend the lexan piece into shape and fill all gaps with The Goo.
In the future, to prevent such damage, smear ShoeGoo around those areas. Especiall on buggy bodies, I use that Fibre-Tape (the one that you can use to paint mesh effects) together with ShoeGoe to reinforce critical areas. Makes the bodies last a long time.