Looks good. If you reuse the stairs, think about adding another foot board back at the heel. If you study the grain on your stringers, you will see that only supporting the toe results is pretty weak support. Granted, it doesn't fail catastrophically, since it only has 1-1/2" to fall, but cracks running with the grain and split, ruined stringers are pretty common without support at the heal. On large, outdoor stair runs, I occasionally add another piece of 2x, as a stiffener, attached to the stringer, under the first tread, with the grain parallel to the tread. Oh, and what's with the plumber's strapping heading into the dirt?