I need to build a covered run this Spring... But I think I will use PVC clear panels for light. Only the roof will be covered as its an outdoor run.I can see the logic but I am going to be building an open air coop which will have a lot of ventilation and will be including a thermostat controlled exhaust fan for the steamy central Texas summers. I am going with metal primarily because of the availability. I purchased all the metal from my neighbor when he tore down a huge shed. I have covered my runs and duck coop and still have a pile left. I am very big on repurposing everything.