There'll not be any single "trick", but yes I suppose they could see how certain components were fabricated. That'll help them check if there own parts were over or under engineered.
However, the cars will all behave slightly differently and a strong component on one car could turn out to be weak on another.
Whilst it may be theoretically possible to reverse engineer like that, you will always be 2 or 3 years behind the pace. You'll also never really know how it was designed to behave, nor the "why".
It would be far more effective and glean richer info to simply recruit the designer. Then you'll know both "why" and "how".