The only thing I wonder about though, with wafer thin resi siding… is if you could actually get the two-thread engagement required to mount a lug on it.
Seems that tearing of the siding might be a potential problem when using a nut and bolt to securing a lug somewhere down at the bottom of the first course panels.
I guess if they are considering the siding panels as the "structural frame" of the building, then 250.104[C] would apply. If they are having issues in the area, I don’t see how it could hurt to bond them.
In my area, usually the steel building frame itself is bonded and the siding panels are coincidentally bonded through the screws used to fasten the panels to the metal building frame.
