I'm thoroughly convinced you're NOT an 'Engineer' (maybe a Train Engineer?).
See your boy, iewitness. He talked about Flex-duct and the web support. He mentioned 2" and 3", then said it was the staples that was the supporting factor. That told me he was actually in the business and had hands on experience.
YOU, on the other hand, when telling some story about a furred down dropped ceiling mentioned 24 gauge metal studs, 2' centers, and two fasteners each. And, that someone hung on it. Never did you mention how it was attached to the ceiling. Was it Ramset, was it Roto-hammered, what was the Fastener?
See the difference? iewitness easily discusses the important issues, YOU ... completely avoid them.
(8x8 treated posts, I went back and checked, my apologies. Still doesn't answer the question of foundation support)
I just went back and read (for the first time) his post about the addition supported by two 14' tall columns constructed of nothing more than two bricks per course in alternating directions.
You can tell it's bullshit right away because something like that wouldn't have supported itself, much less a cross beam and a 12' x 16' room addition.
Those columns would have collapsed before they even finished building them.
And as for his "years of experience" enabling him to recognize that the brick columns were not reinforced, anyone who's ever seen a brick before would know there couldn't be anything like a pole inside of it. OTOH, they could've ran rebar through the holes in the bricks and poured concrete in around it.
That wouldn't have been optimal, but it wouldn't have been the imminent disaster he made it out to be either.