Ken, it’s lookin’ just great!
About the winter drainage. You probably have this covered, but in case a later reader hasn’t, this is important. Before the hard freezes come, one will need drain points at the low places. (No need for vent points, because the sprinklers serve that purpose). At several lower points on my layout, I put a tee in the headers, a short drain tube from that running downhill, and a cap fitting at the end. So when the temps go down, and when I have to unhook the garden hoses from the bibbs, I loosen those caps and let it drain. In the spring, I reverse all that. Takes only a few minutes.
Best,
Cliff