3D Master, what Dr. Seth Shostak wrote ("and, actually, outright states") is not in accordance with what you said at all.
May look vaguely humanoid does not equal "are in fact all humanoid or near humanoid".
The qualifyers (bolded above) are all huge and important ones, and should not be discarded so lightly..
Uh, the qualifiers mean the same thing; what he said, is what I said.
Oh, I'm sure it doesn't, the problem is, virtually all of those that don't converge to the body plant, won't be building starships, or even anything at all.
Shostak never said that intelligent aliens
WILL look vaguely humanoid; he said they
MAY -- meaning that it is possible that they will look vaguely humanoid (bipedal, two eyes, stands erect). He said that we are
one successful design for an intelligent species, not the only good design for an intellligent species.
I can imaging an alien that has 4 eyes the allows for 360 degree vision (and a brain the can process 360 degree vision). This alien will may not need a neck, since it does not need to turn its head to see predators/prey or dangers/food. If it has no neck, then it probably does not have something we call a "head" -- although its eyes and brain could very well be near the top of its headless torso to better view its environment.
I wouldn't call a 4-eyed headless alien "humanoid" or even "vaguely humanoid", even if it stood erect and was bipedal. Although I don't see any reason why a 4-eyed headless alien could not build and drive a starship.