Looks like you got all your ducks in a row, and are well on your way to building a nice homestead.
However, looking at your barn, I'm wondering why they didn't stagger, and butt the ends of the roof purlins over different trusses, instead of ending them all on the same truss. Probably not that critical, as the sheet metal will tie it all together, provided the sheet metal joint doesn't fall on those particular trusses, where all the purlin ends are butted together.
