durabol wrote:
I was wondering lately how much are planes structurally designed or
how much do they follow standard construction techniques (copying)
developed for light aircraft?

Brock

Any engineer worth his salt will copy any feature that contributes to
his goals. Any aircraft that is to be approved by the FAA for a CofA
will be supported by structural analyses.

So the answer is yes to both questions, I guess.

Brian W