Ohh I know that struggle! The build took way longer than I expected.
As for shade, yes.. I have a thick fabric tarp that I'm going to attach to the top of the little house and then the end of the run. Hoping having a gap there will provide plenty of airflow. I also have a ton of natural shade on the property.
On the topic of the run floor.. we had so much rain this year with freak storms and a hurricane that even though drainage is great, the run still got muddy. Got some advice to try Pelletized Pine. It was a game changer! Basically when it gets wet, it turns into thick fluffy sawdust- minimal dust. (I know Central TX didn't have the same issue with rain but many people purposely wet the pellets to great the fluffy material). My entire run is basically a litter box now so I can just scoop up the poo.
I tried the grass clippings route in the run but noticed the chicks were gorging themselves on it. It also got mushy.