Very nice!
If you want to keep it from warping I would paint the outside wood asap or at least cover it with tarp in rainy weather if painting is impossible for now. The elements can ruin a job that was well done. We listen to advance weather reports to let us know when we need to prepare.
FYI - we kept some of our straw, feed, oyster shell, etc, in heavy duty plastic trash cans and mice (or rats) chewed right through thick plastic barrels to get inside. We switched to 10-lb and 20-lb metal locking pails to store anything for the chickens now and so far so good. Mice and rats can chew right through stucco or solid wood too if they smell food on the other side. Large predators are dangerous to chickens but these little rodent pests are a real nuisance and mess for us humans!