Yes, the airframe is very robust, I think (like its much bigger stable-mate). The engine, excellent for 1965, was the main drawback by the late '70s. Apart from the noise, the hot-weather performance was embarrassing. You had to load about 80 kgs of de-min water to gain about 200 kgs improvement in RTOW, if memory serves. Net gain, about 1 or 2 passengers.
Guess the Schiphol guys finally knocked the Tay idea on the head with the F100?