Before I start, I need to make this clear that this isn't a criticism of RKOwens4's post. He makes a good point about the validity of the engineering expertise that the AE911T group claims to have, and I agree with that point. Their credentials are indeed overstated.
But, that said, to me it doesn't matter how many engineers they have. The acid test has always been the claim itself, not the authorities behind one stance or another. That is the essence of objective analysis: "Does the claim stand or fall on its own merits?". By itself, the number of people making a claim does not impress me when the number is cited by itself without corresponding arguments for why the number matters. I'm impressed when I learn that a majority of scientists support one hypothesis over another when I also understand the rationale behind their support, and the logic they apply to come to a conclusion (the Cold Fusion issue is a good example of this). I am not impressed with a number alone, and I am most certainly not impressed when I discover that the individual motivations behind support for a thesis are revealed to be either based on misunderstandings and misrepresentations, or just plain flawed. And that's the case with the AE911T list. When you read through the reasons the members give for joining, you see nothing but the canards and mistakes that have been shown to be wrong over and over here and in other forums. You don't see any original thinking, and you most certainly do not see any attempt to modify stances based on developing knowledge. How many people continue to stand behind the thermite fantasy despite the utter lack of characteristic effects, let alone the absolute misrepresentation of information that Steven Jones commits?
Knowledge develops, and when it does, hypotheses must develop as well. You see very little of this in the so-called truth movement. Credit Steven Jones for at least trying to follow along that line, but criticize others for failing to do so. And include the AE911T group in that.
Anyway, the point is that the individual rationales for people joining that list are flawed; that much is obvious by reading the rationales provided. They continually cite disproven issues as being the driving force for them joining. So to me, it doesn't matter if the individual adding him/herself to the list is a software engineer, or is credentialed in fire safety for large structures, the point is that the belief itself is wrong regardless of the credentials held by the person stating it. Einstein himself would be wrong if he stated something that violates physical laws, nevermind his expertise in physics. His credentials don't matter. And neither do the ones held by the members of AE911T. I'm not impressed by the members individual reasons for joining that group, I'm not impressed by the "scholarship" the organization produces, and I'm most certainly not impressed by the conspiracy peddlers continual use of that group as a lazy appeal to authority. The problem has always been and will always be the details of the truther argument itself. And until the flaws are solved, it doesn't matter who says they believe in it. So in the end, it doesn't matter what their claimed expertise is, or what the number of "real" engineers is in that organization. What matters is their stance, and the utter separation from reality it has.