A construction project is overdetermined to a degree that few other enterprises are. In terms of compensation, an hour of a practicing structural engineer (aside from Calatrava & co.) is worth about as much as a carpenter's (who's paid his dues, so at about the same level of investment as engineer's into his profession). In terms of know-how or sweat equity or risk minimization, it's near impossible to say who, if anyone, contributes disproportinately more than others.