From my 30 years plus in composite structures , building , designing , later into composite structure analysis let us say done my share in the field ( working with CARF mainly in the military aspect of drones , CARF models is no more than a hobby and side kick :-) ... ) and my words where in general about high stress maneuvering platform be it CARF products or any other in that matter I'm saying as a fact .... Without complex testing and analysing tooling there's absolutely no way not even an endoscope that can reveal failure in composite structures ... That's why with certain grade of damage its abosulty non recommended to try and fix it ... The risk is extremely high as explained earlier .