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Re: Rafter nailing
Other than the wedge seat which may slide down, that is typical of trusses setting on other trusses. The other thing which looks lacking to me is that there is no vertical or diagonal below where the trusses is bearing on the other truss. This is not always required by the truss engineer, but it is always a 'good idea' anyway.
The strapping is to hold the upper trusses to the lower trusses during high wind events (Bill knows ... hurricanes), and the nails were bent over because that is what was required.
Typically, though, I would have expected the lower trusses to have been sheathed over to form a more rigid diaphragm onto which the upper trusses are set. Not always done and not always required.
What I especially don't like is the coincidental location of the upper truss and strap in the second photo being right at the double knot location in the truss it is bearing on and strapped to. During high wind events, that truss top chord is likely to snap right there, right where it is needed the most (and one of the reasons it is a 'good idea' to have a vertical or diagonal meeting at that point).
I would raise the issues and recommend a structural engineer "design appropriate repairs". If the structural engineer comes down and says 'no repairs are needed', then that is the 'appropriate' repair - none (but it still does not look good) and the engineer bought the failure should it fail.
Tell your client to save that engineer's letter and keep it handy to give to their insurance company (if it says 'no problemo').
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