Not familiar with it either, I usually only see non-structural metal studs interior framing (I've seen a few metal framed truss roofs, but only after-the-fact).
First, all of that is likely galvanized to some degree, and making field cuts leaves exposed ends which typically would need to be treated (except for interior only pieces), meaning pieces in the exterior walls and the roof framing - I would think it would be needed.
Second photo: I don't see very many, if any, permanent diagonal braces on the exterior walls. Wonder where the shear walls (main wind resisting force) are.
Don't see any diagonal bracing on those roof trusses either.
Third photo: Still don't see any diagonal bracing on those roof trusses. One little push or wind and the entire roof system could topple domino-like.
Wonder if the trusses are 'clear span' or if those interior walls are load bearing, as it appears they were installed before the trusses.
Fourth photo: are those stands for the AHU and WH? Is so, wonder if it is strong enough for the WH and if it is considered as 'protection from vehicle damage'? I would think it was not, I've seen cars hit things like that in garages and the cars just push the entire wall assembly into the house.
Then, for the AHU (the left stand, if that is what it is for), what happens when the center support is cut out for return air?
Fifth photo: Is that a stack of pre-assembled wall sections?
Sixth photo: Wow, the driveway is already poured too!
Seventh photo: Hmmm .... I don't see any fall protection for those workers up there walking on those walls ...
I wonder if that truss, like wood trusses, needs a strongback (and I am not referring to the workers
) and needs to be lifted properly (as with wood trusses)?
Eight photo: But then again, I've done that with wood trusses.
Overall comment: I sure see a lot of "temporary" bracing, but "no" "permanent" bracing (such as diagonals, etc. - except for a few lateral braces on the truss bottom chords).
